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guapka [62]
2 years ago
8

There are 160 people in a grade. The ratio of boys to girls is 3 to 5. Which proportion can you use to find the number x of boys

?
Mathematics
2 answers:
egoroff_w [7]2 years ago
6 0

Answer:

3/8 = x/160

Step-by-step explanation:

First, you need to find the total amount of boys and girls, so you add 3+5.

3+5= 8

So 8 is the total, and out of 8 people, 3 of them are boys. Now that you have that, you can set up the first part of the proportion.

3/8

Now, what information does it give you about the people in the grade? It tells you the total amount, but not the number of boys.

3/8 = out of 8 people, 3 of them are boys.

x/160 = out of 160 people in a grade, x of them are boys.

So your final proportion would be 3/8 = x/160.

Bonus:

If you need to find the number of boys in a grade, just solve the proportion as normal, which would give you 60. So there are 60 boys out of 160 people in a grade.

Nezavi [6.7K]2 years ago
3 0

Answer:

60 boys

Step-by-step explanation:

boys : girls = 3 : 5

Total number of people = 160

Let y = common factor:

Therefore, 3y + 5y = 160

⇒ 8y = 160

⇒ y = 160 ÷ 8 = 20

Boys = 3y = 3 x 20 = 60

Girls = 5y = 5 x 20 = 100

So there are 60 boys and 100 girls

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Paul needs to buy paint to cover all outside surfaces of his shed, depicted below. How much area, in square yards, does he need
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Answer:

Area = 145.7 Square yards

Step-by-step explanation:

Since there is no picture attached to depict the house and its dimension, I am taking values of a similar problem.

<em><u>Dimensions of Shed</u></em>

2 walls with dimensions of 15 ½ ft. by 12 ft.

2 walls with dimensions of 25 ¼ ft. by 12 ft.

Ceiling with dimensions of 15 ½ ft. by 25 ¼ ft.

2 windows that are each 2 ft. by 4½ ft. as well as an 8-ft. by 5-ft. door

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We need to find the total wall area and ceiling area which when combined will give us the total area shed's outer surface that needs to be painted.

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Which is the area paul needs to cover with paint.

<em>Note: Converted Square foot to square yard as the problem requires that.</em>

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