Questions on Algebra: Proportions answered by real tutors!

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Question 1085015: Identify if true of false proportions
x^2+y^2=(x+y)^2
Click here to see answer by Shin123(626)

Question 1119451: towela's average step is 35cm long and her mothers is 50cm. towela takes 920 steps for a certain distance. how many steps would mother take for the same distance?
Click here to see answer by josgarithmetic(39616)

Question 1119804: A goat eats 225 kg. of hay in 45 days, while a cow eats the same amount in 15 days. In how many days could they eat 225 kg. of hay together?
Click here to see answer by ankor@dixie-net.com(22740)

Question 1119834: The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.9 grams per mile and standard deviation 0.2 grams per mile .
(a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile ?
Click here to see answer by Theo(13342)

Question 1119941: How do I go about solving this ratio problem?
Jay and Raymond bought some cookies in the ratio 3:5. After Raymond bought another 24 cookies, the ratio became 1:2. How many cookies did Jay buy?
Thanks in advance.
Click here to see answer by Theo(13342)

Question 1120061: In a two-digit number, the sum of the digits is 4. The difference between this number and the number when the digits are reversed is 18. What is the number?
Click here to see answer by josgarithmetic(39616)

Question 1120060: A varies partly as B and partly C. When A=4, B=2 and C=-2, and when A=3, B=3 and C=1.5. What is the value of C when A=0.5 and B=2.7?
Click here to see answer by solver91311(24713)

Question 1120101: Ed invested a certain amount at 10% simple interest per year after 2 years the interest he recieved amounted to 3,000.
how much did he invest?

Click here to see answer by Theo(13342)

Question 1120516: Two identical jars are filled with mixtures of water and vinegar in the ration of 2 to 1 and 3 to 1 respectively. If both jars are emptied into another container, find the ratio of water to vinegar in the resulting mixture.
Click here to see answer by Theo(13342)

Question 1120643: photocopy paper ia packed in reams (500 sheets) . The thickness of the pack is 41mm. What is the thickness of one sheet of paper written in scientific notation using meters

Click here to see answer by josgarithmetic(39616)

Question 1120664: The present ages of two brothers are in the ratio of 7:8.Twenty years ago, the ratio of their ages was 9:11. Find the present age of the older brother
Click here to see answer by greenestamps(13198)

Question 1120695: Y is inversely proportional to x^2 and y=b for a particular value of x. Find an expression in terms of b for y when value of x is tripled.

Click here to see answer by josgarithmetic(39616)

Question 1120895: A photocopier enlarges by a ratio of 7:4. A picture measures 6 cm by 4 cm. How many consecutive enlargements can be made so that the largest possible picture will fit on a sheet measuring 30 cm by 20 cm? Can you please answer this question?

Click here to see answer by Theo(13342)

Question 1120944: The difference between two numbers is 42. If five is added to each of them, the larger number becomes three times the smaller number. What is the larger number at the start?

Click here to see answer by Alan3354(69443)

Question 1121372: if y is the mean proportional between x and z ; show that xy + yz is the mean proportional between x� + y� and y� + z�
Click here to see answer by ankor@dixie-net.com(22740)

Question 1121372: if y is the mean proportional between x and z ; show that xy + yz is the mean proportional between x� + y� and y� + z�
Click here to see answer by greenestamps(13198)

Question 1121859: An office supply store recently sold a black printer ink cartridge for $18.99 and a color printer ink cartridge for $21.99. At the start of a recent fall semester, a total of 44 of these cartridges was sold for a total of $868.56. How many of each type were purchased?
Click here to see answer by Boreal(15235)

Question 1122141: The number of pages read varies directly as the number of minutes. If you can read 20 pages in 45 minutes, how many pages can you read in 18 minutes?

Click here to see answer by josmiceli(19441)

Question 1122143: A loan is charged simple interest at an annual rate of 9.1%. The loan was repaid at the end of 8 months with a check for $896.56. What was the original amount that was borrowed?
Click here to see answer by Alex.33(110)

Question 1122249: x% of y + y% of x = ?
Click here to see answer by Boreal(15235)

Question 1122262: A scale drawing of a building has a width to length ratio of 3:4. Which best describes the width of a scale drawing if the length of the scale drawing is 37 inches.
I got 49 1/3 inches. Is that correct?
Thank you.
Click here to see answer by ikleyn(52776)

Question 1122440: A small cube is cut from a large cube. The ratio of the remaining volume to the original volume is 19 : 27. If the small cube has lengths of 6cm, find the length of the sides of the large cube (before the small cube was removed).
Click here to see answer by ikleyn(52776)

Question 1122433: The ratio of boys to girls in a class is 4:5. The number of girls decreases from 20 to 18. What is the new ratio of boys : girls?
Click here to see answer by josgarithmetic(39616)

Question 1122493: p=p"subscript a" +dgh, solve for g
Click here to see answer by solver91311(24713)

Question 1122708: Suppose S={a,b,c,d,e} .
If a three-element subset of S is selected at random, what is the probability it will contain one but not both of the elements b and c?

Enter your answer as a whole number or a fraction in lowest terms.
Click here to see answer by Theo(13342)

Question 1122709: A seven-digit number (i.e. a whole number between 1000000 and 9999999) is selected at random.
What is the probability that it contains no digits other than 6's, 7's, and/or 8's?

What is the probability it contains two 6's, three 7's, and two 8's?

Enter your answers as fractions in lowest terms.
Click here to see answer by ikleyn(52776)

Question 1122816: An unfair coin is made so that heads is twelve times as likely to come up as tails when the coin is flipped. An experiment consists of flipping this coin just once.
What weight (or probability) does the outcome 'heads' have?

What weight (or probability) does the outcome 'tails' have?

Enter your answer as whole numbers or fractions in lowest terms.
Click here to see answer by math_helper(2461)

Question 1122805: A seven-digit number (i.e. a whole number between 1000000 and 9999999) is selected at random.
What is the probability that it contains no digits other than 6's, 7's, and/or 8's?

What is the probability it contains two 6's, three 7's, and two 8's?

Enter your answers as fractions in lowest terms.
help please.
Click here to see answer by Edwin McCravy(20054)

Question 1123082: The Northwood School Math Club is having a tamale sale. The school has 1600 students, but the club members are not sure how many tamales to make. One day during lunch, the club asked random students if they would buy a tamale. They found that 15 out of 80 students surveyed said they would definitely buy a tamale. How many tamales should the Math Club expect to sell? Use the Fraction Busters Method to solve the proportion:

Click here to see answer by Boreal(15235)

Question 1122817: An experiment has five outcomes, o1, o2, o3, o4, and o5, with corresponding weights w1, w2, w3, w4, and w5. If w1=329,w3=129, w5=1629, and outcome o2 is two times as likely as outcome o4, what is w2?

Enter your answer as a fraction in lowest terms.

Click here to see answer by greenestamps(13198)

Question 1122809: An experiment has four outcomes: o1, o2, o3, and o4, with corresponding weights w1, w2, w3, and w4. If w1=0.15, w3=0.15, and w4=0.25, what is w2?

Enter your answer as a decimal number.
Click here to see answer by greenestamps(13198)

Question 1123519: ms. tripi just got a new pair of sneakers. the sneakers were on sale for $80.99. if tax is 7%, what was the original price of the sneakers
Click here to see answer by solver91311(24713)

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