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Makovka662 [10]

2 years ago

11

30 girls and boys have planned for a picnic. there is a ratio of 3 girls to 7 boys how many boys are there?

1 answer:

adell [148]2 years ago

4 0

To solve the given problem We can consider, 30% are girls of 30 people 70% are boys in 30 people In order to get the number, we just multiply the total number of people with the percentage of the designated target populace.
<span><span>1.    </span>30 x 0.3 = 9 girls</span> <span><span>
2.    </span>30 x 0.7 = 21 boys</span> <span><span>
3.    </span>21 boys + 9 girls = 30 people</span>

Hence, there are 21 boys.

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$Volume\,\,of\,\,cone=1527.1\,\,cm^3$

So, Option C is correct.

Step-by-step explanation:

We need to find Volume of cone.

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The formula used to find Volume of cone is:

$Volume\,\,of\,\,cone=\frac{1}{3}\pi r^2h$

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Using Pythagoras theorem:

$h^2=p^2+b^2\\ (27)^2=p^2+(7.5)^2\\729=p^2+56.25\\p^2=729-56.25\\p^2=672.75\\Taking\,\,square\,\,root:\\p=25.93$

So, Height of cone = p= 25.93

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Putting values in the formula:

$Volume\,\,of\,\,cone=\frac{1}{3}3.14*(7.5)^2*25.93$

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So, Option C is correct.

Keywords: Volume of cone.

Learn more about Volume of cone at:

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