Five years ago, the ratio of A's age and B age was 5 : 6. The ratio of their ages will be 7:8, after five years. What is the ratio of the A present age and the B's present age ? ?
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Step-by-step explanation:
a-1 / b-1 = 5/6
6a-6 = 5b-5
6a-5b = 1…………1
a+4 / b+4 = 6/7
7a+28 = 6b+24
7a-6b = -4 …………..2
Multiply 1 by 6 and 2 by 5
36a - 30b = 6
35a -30b = -20
a= 26
156–5b = 1
b = 31
a,b are 26,31
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