Question

Three Bells toll at intervals of 9, 12, 15 minutes respectively. If they start tolling together, after what time will the next toll together?
(Class 10 Maths Sample Question Paper)

Answer 1

SOLUTION:
We have to find the Lcm of 9, 12, 15

9 = 3 × 3

12 = 2 × 2 × 3

15 = 3 × 5

LCM (9, 12, 15) = 3 × 3 × 2 × 2 × 5

LCM (9, 12, 15) = 180 minutes

Hence, the bell will toll together after 180 minutes.

HOPE THIS WILL HELP YOU....

Answer 2

Hi friend,

We need to find LCM for 9,12,15.

LCM of 9=3×3

LCM of 12=3×2×2

LCM of 15=3×5

Total LCM of (9, 12, 15) = 3 × 3 × 2 × 2 × 5

LCM = 180 minutes.

The next bell will troll at 180 minutes.

Hope this helped you a little!!!