Question

1. Chris takes 25 minutes to replace one car tyre.

Answer 1

Chris and Jim must replace a total quantity of 17 tyres.

What is the minimum number of tyres to be replaced?

In this problem we must use an inequality of the form f(x) ≥ a, where f(x) is the difference between the number of tyres replaced by Jim and the number of tyres replaced by Chris:

(25/20) · x - x ≥ 3

(5/20) · x ≥ 3

x ≥ 12

Then, the minimum number of tyres to be replaced is n = 15 + 12 = 17 tyres.  

To learn more on inequalities: brainly.com/question/20383699

#SPJ1