Question

1+4=5 2+5=12 3+6=21 5+8=

Answer 1

1+4 = 5
1*4 + 1 = 5

2+5 = 12
2*5 + 2 = 12

3+6 = 21
3*6+3 = 21

Hence 5+8
= 5*8+5
= 45.

Hope it's helpful to u.