Question

the answer of LCM are 10= 2×5, 15= 5×3 and 40=2×2×2×5​

Answer 1

$10 = 2 \times 5$

$15 = 5 \times 3$

$40 = 2 \times 2 \times 2 \times 5$

LCM is 5

I hope this helps you!