Question
The present average age of Sana and Dev is 30 years.
After 4 years, their ages will be in the ratio 8:9. Find Dev’s age 7 years ago.Solution
ATQ,
let present ages be (8x − 4) and (9x − 4). (8x − 4) + (9x − 4) = 30 × 2 17x − 8 = 60 17x = 68 x = 4 Required age of Dev = (9x − 4) − 7 = (9 × 4 − 4) − 7 = 25 years
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