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?
Answer: Option A
:
A
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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:
A
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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