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Ram’s age was square of a number last year and it will be cube of a number next year. How long must he wait before his age is again the cube of a number?
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- 39 years
- 10 years
- 38 years
- 64 years
Correct Option: C
Let us assume at present Ram’s age is 26 years
Last year his age = 26 – 1 = 25 = (5)2
Next year his age = 26 + 1 = 27 = (3)3
After 27, the next cube number is 64 = (4)3
∴ Required answer = 64 – 26 = 38 years