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3 years ago

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At a country concert, the ratio of the number of boys to the number of girls is 2:7. If there are 250 more girls than boys, how

many boys are at the concert?

1 answer:

zvonat [6]3 years ago

8 0

Boys : Girls = 2:7
let the no. of boys be x
so no of girls = 250+x
so, x:(250+x) = 2:7
x/(250+x) = 2/7
7x = 500+2x
7x-2x = 500
x = 500/5 =100

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Answer:

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And solving for the radius we got:

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And replacing the data given we got:

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Step-by-step explanation:

For this case we know the population size $P = 20000$ and we also know the population density $D = 480 \frac{people}{km^2}$

We can assume that the area is a circle. We also know that the formula for the population density is given by:

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$D =\frac{P}{\pi X^2}$

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