Question

[]+[]+[]=30
Only use (1,3,5,7,9,11,13,15.)
Don't use - only use +,÷ or ×
Solve only three step.

Answer 1

15+5x3=30 it was very simlpe

Answer 2

kk so here we use multiply
7*3+9=30
21+9=30

so,therefore we  proved :)