Answer:
143 oil changes
Step-by-step explanation:
Let's find out Frances' rate per 1 day. We can set up a proportion, since we know he can do 91 oil changes in 7 days:
[tex]\frac{91}{7} =\frac{x}{1}[/tex], where x is the number of oil changes Frances can do in 1 day
Cross-multiply:
91 * 1 = 7 * x
7x = 91
x = 91/7 = 13
So Frances can do 13 oil changes in 1 day. Set up another proportion to find how many oil changes he can complete in 11 days:
[tex]\frac{13}{1} =\frac{y}{11}[/tex], where y is the number of oil changes Frances can do in 11 days
Cross-multiply:
13 * 11 = 1 * y
y = 143
The answer is 143 oil changes.
Hope this helps!
