Mathematics: Jamal and his friends are conducting a car wash to raise money for a school play. over the first weekend they raised $336.00 which was 80% of what they set out to earn. if they collect $21 for each car they wash, how many more cars must they wash?

Jamal and his friends are conducting a car wash

antoniomunoz424

13.03.2022

Let's call the desired amount. We know that the 80% of x is 336. Since we compute the 80% of something by multiplying it by 0.8, we have

$0.8x = 336 \implies x = \frac{336}{0.8} = 420$ .

So, they still need to collect

420-336 = 84 dollars.

At a rate of 21 dollar per car, they still have to wash

$\frac{84}{21} = 4$ cars.

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highspeed7100

28.06.2021

$d=4 \Rightarrow r=2\\V=\dfrac{4}{3}\pi r^3\\
V=\dfrac{4}{3}\pi \cdot2^3\\
V=\dfrac{4}{3}\pi \cdot8\\
V=\dfrac{32}{3} \pi
$

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