Question
The present age ratio of A and B is 4:7. After 5 years,
the ratio of their ages will be 5:8. Find the present age of B.Solution
Let the present ages of A and B be 4m and 7m respectively.
ATQ, 
Present age of B = 7m=7×5=35 years.
4, 14, 44, 134, ?, 1214
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