Question

please please solve this problem
from number 2 to 4 with full process

Answer 1

2)18% of 650boys take commerce
18% of 650=18/100×650
=117
therefore it is 117boys

4)15% have picture
100%-15%=85%
so 85%don't have picture
now,
85% of 160 pages
=85/100×160
=136 pages don't have picture