Question

Ben exercises every $12$ days and Isabelle every $8$ days. Ben and Isabelle both exercise today. How many days will it be untill they exercise together again?

• A. $21$
• B. $22$
• C. $23$
• D. $24$

Answer 1

The correct option is D $24$

Given: Ben exercises $12$ days

Isabelle exercises $8$ days.

$12=2\times 2\times 3$

$8=2\times 2\times 2$

$LCM$ of $12$ and $8$ $=2\times 2\times 2\times 3=24$.

It will be $24$ days until they exercise together again.

So, option D is correct.