The number of students joining a class prior to 20 minutes is 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?

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

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

Suggest Corrections

Similar questions

The number of students joining a class 20 minutes back is 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?

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?

Q. 20 students of Class VI could make 40 paper lanterns in one hour. If 10 students from Class VII also joined them, how much time (in minutes) would be required to make the same number of lanterns?

The number of students joining Byju's classes increase every year by 10%, If the number of students in Byju's at present is 20000. Find the number of students in Byju's classes after two years.

The number of students joining tuitions is 100000 in 2008 and it is expected to grow 10% every year. In that case what is the total number of students going for class in 2013?

Join BYJU'S Learning Program