Answer: See below
Step-by-step explanation:
For both problems, we can use a proportion to solve.
1.
[tex]\frac{56 min}{4 tyres} =\frac{x}{12 tyres}[/tex] [cross multiply]
672=4x [divide both sides by 4]
x=168
It would take 168 minutes or 2 hours and 48 minutes.
2.
[tex]\frac{56 min}{4 tyres} =\frac{42min}{x}[/tex] [cross multiply]
56x=168 [divide both sides by 56]
x=3
Liam would be able to fit 3 tyres.
