The ages of a and b are in the ratio 3: 4. if the ratio of their ages 15 years back was 3: 5, find the sum of their present ages. 1)56 years 2)63 years 3)70 years 4)84 years
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a/b=3/4
or, 4a-3b=0..... (1)
in case of their age 15 years before...
a-15/b-15=3/5
or, 5a-3b=30....(2)
(1)×5 and (2)×4 and get value of any one of them. put the value in any equation and get the other.
sum them up. Answer is 3) 70 years
or, 4a-3b=0..... (1)
in case of their age 15 years before...
a-15/b-15=3/5
or, 5a-3b=30....(2)
(1)×5 and (2)×4 and get value of any one of them. put the value in any equation and get the other.
sum them up. Answer is 3) 70 years
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