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3 years ago

The ratio of boys and girls in a 4:3.If there are 20 boys, find the number of girls.

Mathematics

2 answers:

rosijanka [135]3 years ago

8 0

Answer:

Step-by-step explanation:

Add:

boys : girls

4 : 3 = 7

20: ? = ?

Divide:

20 / 4 = 5

5 × 3 = 15

20: 15

So, there are 15 girls.

Elina [12.6K]3 years ago

6 0

Answer:

There are 15 girls.

Step-by-step explanation:

The ratio is 4:3, meaning there are 7 parts.

4 parts= 20 (Boys)

This means 1 part is 20 divided by 4.

1 part= 5

3 parts= Amount of girls.

3 x 5 = 15.

There are 15 girls.

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Read 2 more answers

A train traveling nonstop to its destination is able to make the trip at an average speed of 70 miles per hour. On the return tr

larisa86 [58]

Answer:

Return trip travel time: 7h

Step-by-step explanation:

Let d be the distance.

Index 1 refers to initial trip, index 2 refers to the return trip.

v1=70mi/h

v2=40mi/h

t2=t1+3h, or t1=t2-3h (travel times)

d=v1×t1=v2×t2

v1×(t2-3)=v2×t2

v1 t2 -3 v1=v2 t2

v1 t2 - v2 t2=3 v1

t2(v1-v2)=3v1

t2=3v1/(v1-v2)

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3 0

3 years ago

Which expression can be used to find the volume of the cylinder in this composite figure?

Whitepunk [10]

Answer:

The volume of the cylinder is $112\pi\ cm^{3}$

Step-by-step explanation:

we know that

The volume of the cylinder is equal to

$V=Bh$

where

B is the area of the base

h is the height of the prism

$B=\pi r^{2}$

In this problem we have

$r=4\ cm$

$h=7\ cm$

substitute

Find the area of the base B

$B=\pi (4^{2})$

$B=16\pi\ cm^{2}$

substitute in the formula of the volume

$V=16\pi (7)$

$V=112\pi\ cm^{3}$

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3 years ago

The ratio of boys and girls in a 4:3.If there are 20 boys, find the number of girls.​

The ratio of boys and girls in a 4:3.If there are 20 boys, find the number of girls.