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CDS Model Paper 2 Mathematics
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© examsnet.com
Question : 4
Total: 100
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 ?
10 years
39 years
38 years
64 years
Validate
Solution:
Cube of a number
−
Square of another number
=
2
By trial and error,
3
3
−
5
2
=
2
Hence
27
−
25
=
2
∴ the present age is 26 yrs.
∴ the age in which he is again a cube of number
=
4
3
=
64
∴ no. of years he must wait
=
64
−
26
=
38
yrs.
© examsnet.com
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