The ratio of Neha's age to that of Jane is 4:7 and the ratio of Jane's age to that of Smita is 4:3. If Smita is 21 years old, how old is Neha?

Ratio of Neha's age to that of Jane is 4:7. This means;
Neha's ageJane's age=47
So, Neha's age = 47× Jane's age.........(i)
Now, Ratio of Jane's age to that of Smita is 4:3. This means;
Jane's ageSmita's age=43
So, Jane's age = 43× Smita's age = 43×21 = 28 years
Putting Jane's age in (i) we get;
Neha's age = 47×28 = 16 years
Therefore Neha is 16 years old.

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