It also belongs to set of natural numbers.
8n-(2n-3)=12
8n-2n+3=12
6n=12-3
6n=9
n=9/6=3/2
5 bonus on 50 is 5/50 *100%=10%
5 bonus on 100 is 5/100 *100%=5%
Answer: for 50 points.
42+30= 72
6 (36+24)=120 not equal
7 (6+30)=252 not equal
6 (7+5)=72 equal
5 (37+35)= 360 not equal
