Question

if 16=11,25=12,36=15, then 49=? how

Answer 1

The calculation of multiples.

16=11 ⇒√16=4
4=11

25=12⇒√25=5
5=12

36=15⇒√36=6
6=15

49=?⇒49=7
7=?

So,
Look at the picture.