The gym has a total of 25 treadmills and stationary bikes. There are 7 more stationary bikes than treadmills. Solve your system to find how many tredmills are in the gym.

Answer 1

b + t = 25

b = t + 7

Substitute!

(t + 7) + t = 25

2t + 7 = 25

2t + 7 - 7 = 25 - 7

2t = 18

2t/2 = 18/2

t = 9