Peter is trying to work out by completing sit-ups and push-ups in order to gain muscle mass. originally, peter was completing five sit-ups for every three push-ups, but then he injured his shoulder. after the injury, peter completed the same number of repetitions as he did before his injury, but he completed seven sit-ups for every one push-up. during a training session after his injury, peter completed eight push-ups. how many push-ups was peter completing before his injury?

24 push- ups

Step-by-step explanation:

before injury the sit-up to push-up ratio was 5:3

after the injury the sit-up to push-up ratio is 7:1

now it is given that  after his injury, Peter completed eight push-ups and he  completed the same number of repetitions as he did before his injury

now eqauting the ratio 1 = 8

therefore 3= 3*8 = 24

so, peter did 24 push-ups after his injury

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)