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Question

The number of students in class 20 minutes ago was 729 . If the number of students joining the class triples every 10 minutes, what is the cube root of the number of students joining after 40 minutes from now?


A

81

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B

27

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C

64

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D

48

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Solution

The correct option is A

81


For every 10 mins passage of time, the number of students joining the class gets tripled i.e. multiplied by 3

The number of students joining after 40 minutes from now on is 729×3×3×3×3×3×3 ( from 20 mins back to 40 mins forward)

The cube root of 729 is 9.

Cube root of given number is 9×3×3=81


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