Questions on Algebra: Proportions answered by real tutors!

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Question 616523: A 30% solution of barium chloride is mixed with 10 grams of water to form a 20% solution. How many grams of the original solution did we start with?
A)10
B)15
c)20
D)25
E)30
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Question 616963: A card is drawn from a deck of cards numbered 1-20. The card is NOT replaced and another card is drawn. Find the probability that a prime number is drawn and then a composite number. I am totally lost...Please help...thank you
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Question 616963: A card is drawn from a deck of cards numbered 1-20. The card is NOT replaced and another card is drawn. Find the probability that a prime number is drawn and then a composite number. I am totally lost...Please help...thank you
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Question 616961: A number cube rolled and a number card is drawn from cards numbered 1-14. Find the number of possible outcomes for the situation.
P(a+b)=P(a)+P(b) A=(1,2,3,4,5,6) B=(1,2,3,4,5,6,7,8,9,10,11,12,13,14)
1/6 +1/14= 8/42+4/42=12/42 divide by 6 =2/7. Please help..Thank you
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Question 617089: The advertisement price of potatoes is 35 cents per pound. If a 3-pound bag actually weighs 3 1/4 pounds, what is the closest approximation in cents to the actual price per pound for that bag?
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Question 617094: A rectangular garden is 20 yards long and 10 yards wide. If it costs 80 cents per square yard to seed the lawn and $7.00 per running yard to put up a hedge around the garden, what is the total cost in dollars of seeding the garden and putting up a hedge around it?
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Question 617350: Please help solving this problem: +4+%3C+sqrt%28x%29+%3C+9+
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Question 617545: A air plain travelled 120km in 12 minutes to the nearest km what was its rate per hour?
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Question 617874: For the following direct variation, give an equation that relates the two variables and includes a variation constant. The kinetic energy (KE) of a 1kg mass is directly proportional to the square of the speed (v). Variation constant=1/2. If there is no solution, type "no solution". If there is not enough information present to solve the problem, type "not enough information".
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Question 617865: The conductance of a wire varies directly as the square of the wire's diameter and inversely as it's length. Fifty meters of wire with a diameter 2 mm has a conductance of 0.12 ohms. If a wire of the same material has length of 75m and diameter of 2.5mm, what is its conductance? I need help. I have been on this problem for over an hour.
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Question 618062: The scale on a map shows that 5 cm represents 8.5 km. Which proportion can be used to find d, the distance between two cities, if the distance on the map is 18 cm?
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Question 618270: 18:54 = c:42
c = ?
how do i compute this? Thank you.
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Question 618276: please help me solve this equation f(-3) with f(x)=5x-6, it says you need to solve for f(x)
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Question 618264: Please help me solve the question:
Find the sum of all the multiples of seven between 18 and 711
Thanks =)
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Question 618378: Given that n varies directly with m with the constant k=5/6. If n=9, find m to the nearest tenth.
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Question 619049: in a scale drawing of a city the distance of 45 kilometers is represented by a line sector 3 inches long . on the same drawing what distance is represented by a line sector 2 inches long
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Question 619060: A model is made of a car. The car is 10 feet long and the model is 7 inches long. What is the ratio of the length of the car to the length of the model?
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Question 619714: what is 20 1/4% of 760?
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Question 620029: the ratio of income of A to that B is 5:4 and the expenditure of A to that of B is 3:2 if at end of the year each saves 800 the income of A is ?
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Question 620942: The distance between two cities is 18 kilometers. How far apart should the cities be on a map with a scale of 1/2 centimeter = 3 kilometers? and that's all it says.
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Question 621192: What is 2 over 1 equals to 8 over 50
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Question 621192: What is 2 over 1 equals to 8 over 50
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Question 621793: Carl has $135 in the bank and plans to save $5 per week. Jean has $90 in the bank and plans to save $10 per week. How many weeks will it be before Jean has at least as much in the bank as Carl?
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Question 621804: What is three-fourths squared?
3/4 ^2
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Question 621805: What is three-fifths cubed?
3/5 ^3
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Question 622165: in a certain company 140 of the employees are men. what is the total number of employees if 5 out of every 7 employees are men
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Question 622672: please help me find the solution of converting 365 days - seconds
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Question 622678: what is the solution of converting 365 days - seconds
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Question 622678: what is the solution of converting 365 days - seconds
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Question 622675: please help me find the solution of converting 365 days - seconds
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Question 622677: please help me find the solution of converting 365 days - seconds
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Question 622824: 16%2F%282-x%29=4%2Fx
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Question 622953: if 60 women spin 48 kg of cotton by working 8 hrs daily, how much cotton will 30 women spin by working 12 hrs daily?
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Question 622912: I'm confused about percents, and obtaining specific numbers using the decimals of percents of over 100%.
For example I want to obtain a product of 75,000 using 103% value.
So what I do is this:
(75,000 / 0.97) * 1.03 = 74932.5
I NEVER get exactly 75,000 value using the 103%. I want it exactly 75,000!
Thanks in advance.
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Question 622905: A man spends in 3 months what he earns in 2 months. IF his savings his rs. 125 per month. Find his monthly income ?. Q2. If a certain number is multiplied by 5 and 7 is added to the product and sum is divided by 3, then 3 is subtracted from the quotient, the result is 11. Find the number ?
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Question 623048: Can you please help me with something? My question is how do i solve proportions?
I've been trying to figure that out and i was hoping you could help me. Thank you for your time to help me. You are nice
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Question 623131: what fraction of an hour is 1,350 seconds?
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Question 623285: Solve the Proportion for x: x/8 = 5/3
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Question 623786: The distance, d, a ball will roll down an inclined plane is directly proportional to the square of the time, t. If the ball rolls 8 ft in 2 seconds, how far will it roll in 4 seconds?
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Question 624691: Greek architects considered a rectangle whose -1.5,2.6,6) to be the most visually appealing. Find the length and width of a rectangle constructed in this manner if the sum of the length and with is 130 ft.
HELP ME PLEASE.
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Question 624842: If three men take 3 days to complete a piece of work, how many days will 2 men take to complete the same piece of work?
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Question 624868: John saves Nu. 2 in january, Nu. 6 in february, Nu. 18 in march and so on. The total saving in one year by John is how much?
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Question 624869: 2 persons, A and B start running a certain distance at 8 and 10kmh respectively. gB reaches the destination 6 minutes earlier. The distace is:
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Question 625050: what is 1/4 of half of 1/5 of 200
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Question 625375: Can someone please help me with the rational expression please?
to determine the number of deer in a game reserve, a conservationist catches 658 deer, tags them and lets them loose. Later, 724 deer are caught, 182 of them are tagged. how many deer are in the preserve?
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