Mathematics, 06.10.2019 09:02 Ashwaf23474

Some students washed 24 cars in 2 hours. how many cars can they wash in 15 hours?
a. 12
b. 48
c. 180
d. 360

Answers: 2

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Answers

Answer from: kluke7170

Itd be c.180 because itd be 12 cars each hour so times 12 by 15

Answer from: needhelpasap4900

option c is correct

180 cars can they wash in 15 hours

Step-by-step explanation:

Unit rate defined as the rate are expressed as a quantity 1 such as 4 miles per hour or 5 meter per second.

As per the statement:

Some students washed 24 cars in 2 hours

Then by definition of unit rate.

$\text{unit rate per hour}=\frac{24}{2} = 12$

We have to find how many cars can they wash in 15 hours

⇒ $\text{Number of cars washed in 15 hours} = \text{Unit rate per hour} \cdot 15$

Substitute the given values we have;

$\text{Number of cars washed in 15 hours} = 12 \cdot 15$

Simplify:

$\text{Number of cars washed in 15 hours} = 180$

Therefore, 180 cars can they wash in 15 hours

Answer from: Quest

$\bf ~~~~~~~~~~~~\textit{distance between 2 points} \\\\ a(\stackrel{x_1}{5}~,~\stackrel{y_1}{4})\qquad b(\stackrel{x_2}{x}~,~\stackrel{y_2}{y})\qquad \qquad d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2} \\\\[-0.35em] ~\dotfill\\\\ ~\hfill \stackrel{ab}{7}=\sqrt{(x-5)^2+(y-4)^2}~\hfill$

Answer from: Quest

starting with:

5 + x - 12 = 2x - 7

5 + x - 12 - x = 2x - 7 - x (subtract x from both sides)

5 - 12 = x - 7 (combine and cancel x's from both sides)

5 - 12 + 7 = x - 7 + 7 (add 7 to both sides)

0 = x (add numbers together on both sides)

so in order for the equation to be true, x must be 0.

trying x = -0.5

5 + x - 12 = 2x - 7 (original equation)

5 + -0.5 - 12 = 2(-0.5) - 7 (plug in value of x)

5 + -0.5 - 12 = -1 - 7 (did multiplication)

-7.5 = -8 (did addition on both sides)

since -7.5 is obviously not equal to -8, the value of -0.5 for x is wrong.

trying x = 0

5 + x - 12 = 2x - 7 (original equation)

5 + 0 - 12 = 2(0) - 7 (plug in value of x)

5 + 0 - 12 = 0 - 7 (did multiplication)

-7 = -7 (did addition on both sides)

since -7 equals -7, that demonstrates that the value of 0 for x is correct.

trying x = 1

5 + x - 12 = 2x - 7 (original equation)

5 + 1 - 12 = 2(1) - 7 (plug in value of x)

5 + 1 - 12 = 2 - 7 (did multiplication)

-6 = -5 (did addition on both sides)

since -6 is obviously not equal to -5, the value of 1 for x is wrong.

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Some students washed 24 cars in 2 hours. how many cars can they wash in 15 hours?
a. 12

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