Frances can complete 91oil changes in 7 days. How many oil changes can Frances complete in 11days? oil changes
2 answers:
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:
, 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:
, 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!
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Answer:
A dress originally costs $120
Step-by-step explanation:
To find the original cost of the dress, we will follow the steps below;
let x represent the original cost of the dress
75% of x = $90
× x = $90
= $90
MULTIPLY both-side of the equation by 100
× 100 = $90×100
At the right-hand side of the equation, 100 will cancel out 100, leaving us with just 75x
75x = $9000
DIVIDE both-side of the equation by 75
75x/75 = $9000/75
At the left-hand side of the equation 75 will cancel-out 75 leaving us with just x
x= $9000/75
x = $120
A dress originally costs $120