Question

A health club offers membership for a fee of $21 plus a monthly fee of $28. club b offers a membership for a fee of $42 plus a monthly fee of $21 after how many months will the total cost be the same

Answer 1

Club A: C=cost M= #of months
C=28m+21

Club B:
C=21m+42

Make them equal each other

28m+21=21m+42
-21m      -21m

7m+21=42
      -21   -21

7m=21
/7     /7

m=3

so in 3 months the cost would be equal