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Daily earnings of two persons are in ratio 4 : 5 and daily expenses in ratio 7 : 9. If each saves Rs.50, their daily earnings in Rs are
A(50, 40)
B(400, 500)
C(40, 50)
D(800, 1000)
Answer & Solution
Correct answer: B. (400, 500)
1. Let earnings be 4k and 5k; expenses are 4k - 50 and 5k - 50.
2. Given (4k - 50)/(5k - 50) = 7/9.
3. 9(4k - 50) = 7(5k - 50), so 36k - 450 = 35k - 350.
4. k = 100, so earnings = 4(100) = 400 and 5(100) = 500.
_Source: ICAI BoS Foundation Paper 3, Ch 1 Unit I 'Ratio', p.5 Ex.1(A) Q24_
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