Sounds like rearranging to me:
P=2(a+b) -- expand brackets
P=2a+2b -- subtract 2a
P-2a=2b -- divide by 2
b=(P-2a)/2
5 : 5, 10, 15, 20, 25
6 : 6, 12, 18, 24, 30
Answer:
67.15
Step-by-step explanation:
subtract 15 percent of 79 from 79
I am not 100% sure this is right but I believe its 28:)
