How do i figure out question 1 part b? ? i know the answer is 56(the answers are in the back of the textbook) but how do i show my working / figure it out ? by the way the answer to part a is

Rugby teams have 13 in the starting line up and 4 subs. That means there are (13 + 4) = 17 players on each team. And if there is 8 teams...
(8 * 17) = 136 total players

each team has 6 forwards and 1 sub forwardso that (6 + 1) = 7 total forwards per team. And if there is 8 teams(8 * 7) = 56 forwards

a) 13+4 = 17 players each team

17*8 = 136 total players

b) 7 forwards per team 7*8 = 56 forwards

A = x + 5

B = x - 5