Question 79

The salaries of two persons are in the ratio 4: 7. Both spend 80% of their salaries and save the rest. The ratio of their savings is

Solution
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Let the salaries be 4x and 7x. 
As both spend 80% of their salaries and save 20%, the amounts saved are 0.2*4x = 0.8x and 0.2*7x = 1.4x
The ratios of savings = 0.8:1.4 = 4:7

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