Brittany V. answered 05/05/20
PharmD Student with Ample Tutoring Experience
Hi Haldana! For this problem you would need to set up a proportion. If Pamela can drive 99 km using 9 gallons of gas that can be set equivalent to x km with 12 gallons of gas. Your proportion would look like this...
99 km = x km
9 gal 12 gal
You would then cross multiply to set up the equation...
99 km (12 gal) = 9 gal (x km)
Your final answer would be 132 km. To check that your answer is correct, simply plug 132 km back into your original proportion to make sure that both sides of the proportion equal one another.