Question 541198: please help me solve these questions that i don't know with proper steps:-
1)a vessel contains 20kg of diluted milk of which 2/3 is pure and the rest is water.what amount of it is water?
2)to make a miniature car,you need tyres,with a diameter between 1.465cm and 1.472cm.will a tyre that is 1.4691cm in diameter work?explain why or why not.
3)in a certain class, the ratio of passing grades to failing grades is 7 to 5.how many of the 36 students failed in thee course?
4)the fourth proportional to 5,8,15 is____________
5)in a bag,there are coins of 25p,10p,5p in the ratio of 1:2:3.if there is Rs 30 in all,how many 5p coins are there?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 1)a vessel contains 20kg of diluted milk of which 2/3 is pure and the rest is water.what amount of it is water?
Ans: (1/3) is water
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2)to make a miniature car,you need tyres,with a diameter between 1.465cm and 1.472cm.will a tyre that is 1.4691cm in diameter work?explain why or why not.
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Is 1.469 < 1.472 ?
Yes because 72 is greater than 69
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Is 1.469 > 1.465 ?
Yes because 69 is geater than 65.
-Therefore 1.465 < 1.469 < 1.472
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3)in a certain class, the ratio of passing grades to failing grades is 7 to 5.how many of the 36 students failed in the course?
7x + 5x = 36
12x = 36
x = 3
5x = 5*3 = 15 (# of failed students)
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4)the fourth proportional to 5,8,15 is x:
5/8 = 15/x
1/8 = 3/x
x = 24
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5)in a bag,there are coins of 25p,10p,5p in the ratio of 1:2:3.if there is Rs 30 in all,how many 5p coins are there?
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# of 25p: x
# of 10p: 2x
# of 5p : 3x
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Quantity Equation:
x + 2x + 3x = 30
6x = 30
x = 5
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# of 5p coins = 3x = 15
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Cheers,
Stan H.
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