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sveticcg [70]
3 years ago
9

In this year’s 7th grade class, there are 4 boys for every 5 girls. How many girls are in the class if there are 20 boys in the

class?
Mathematics
2 answers:
Charra [1.4K]3 years ago
7 0

Answer:

No. of girls  =25

Step-by-step explanation:

Ratio of boys: girls = 4:5

No. of boys = 4x

No. of girls = 5x

4x = 20    ( No.of boys = 20)

   x = 20/4

    x = 5

No. of girls = 5x = 5 * 5 =25

Harlamova29_29 [7]3 years ago
3 0

Answer:

25girls

Step-by-step explanation:

4b=5g

20b=25g

4b/20b=5g/?

5g x 20b=100

100/4b=25g

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Answer:

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Given:

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The curved urface area of a cone i 140π cm2. What will be the radiu of a cone whoe lant height i 5 cm
VashaNatasha [74]

The radius of a cone with a curved surface area of 140π cm² and a slant height of 5 cm will be 28 cm.

<h3>What is curved surface area?</h3>

The region with just curved surfaces, leaving the circular top and base, is referred to as the curved surface area. Total Surface Area is the combined area of the bases and the curved surface. The measurement of a solid's curved surface area is its outer area, which excludes the top and bottom extensions. Surface area of the cylinder that is curved: A right circular cylinder is the solid that results when a rectangle circles around one side and makes a full revolution. The curved surface area of a cylinder (CSA) is also known as the lateral surface area and is defined as the area of the curved surface of any given cylinder having a base radius "r" and height "h".

Here,

Curved surface area of cone=πrl

=140π

l=5 cm

140π=πr*5

r=140/5

r=28 cm

The radius of cone that has 5 cm as slant height and 140π cm² as the curved surface area will be 28 cm.

To know more about curved surface area,

brainly.com/question/1037971

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Trisha is going to make a border of icing around a circular cake with a diameter of 8 inches which of the following represents t
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B. 25.12

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Perimeter: 25.12 inches

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3 years ago
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