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What is the ratio whose terms differ by 40 and the measure of which is 2/7?

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What is the ratio whose terms differ by 40 and the measure of which is 2/7?
posted Dec 30, 2014 by anonymous

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1 Answer

+4 votes
 
Best answer

Difference between x and y = 40 I.e.
y - x = 40 ............. (1)
x/y = 2/7
Cross multiply;
7x = 2y
7x / 2 = y ............... (2)
Substitute for y in (1);
y - x = 40
(7x/2) - x = 40
Take 2 as lcm;
[7x - 2x] / 2 = 40
5x/2 = 40
Cross multiply;
5x = 2 * 40 = 80
5x = 80
x = 80/5 = 16
x = 16.

7x/2 = y
7(16) / 2 = y
7(8) = y
y = 56.

The fraction is;
16/56

answer Jan 22, 2015 by Jaspalsingh Parmar
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