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EleoNora [17]
3 years ago
10

wally's used cars has 45 cars on the lot. Of these, 20% of the cars are red. How many red cars are there on the lot

English
2 answers:
s344n2d4d5 [400]3 years ago
8 0
The answer would be 9
avanturin [10]3 years ago
3 0

Answer:

9

Explanation:

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 45 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 45 is 100%, so we can write it down as 45=100%.

4. We know, that x is 20% of the output value, so we can write it down as x=20%.

5. Now we have two simple equations:

1) 45=100%

2) x=20%

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

45/x=100%/20%

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 20% of 45

45/x=100/20

(45/x)*x=(100/20)*x       - we multiply both sides of the equation by x

45=5*x       - we divide both sides of the equation by (5) to get x

45/5=x

9=x

x=9

now we have:

20% of 45=9

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