All categories

2 years ago

what's the ratio of boys to girls in a class is 3:4 and if there are 12 boys in the class how many girls are ther

Mathematics

2 answers:

KiRa [710]2 years ago

7 0

Answer:

Step-by-step explanation:

b/g=3/4 so if there are 12 boys this becomes

12/g=3/4 multiply both sides by g

12=3g/4 multiply both sides by 4

48=3g divide each side by 3

16=g

So there are 16 girls in the class.

snow_lady [41]2 years ago

3 0

Answer:

Step-by-step explanation:

Boys is written first so 3:4 the 3 stands for boy.

12 boys in class means that the 3 from 3:4 was multiplied 4 times so you do the same to other side. 4 times 4 is 16, therefore the answer is 16.

You might be interested in

Not sure how to do this

OLEGan [10]

It's pretty simple! So it looks like you are learning proportions. You would cross multiply to achieve your answer.

First, let's do your first problem:

2 12
--- = ----
5 n

You would take 5 and multiply it by 12 and get 60! Then you would do the same with 2 times n, giving you 2n (because you do not know what n represents YET.)

Now you should have this:
60=2n OR 2n=60

We must isolate our variable, in order to do that, get rid of two! But how? You would do this by dividing 2n by 2. Yet in equations, when you do something to one side, you must do it to the other because they must be EQUAL! (hence the "equa-" in equation)

2n=60
--- ---
2 2 DIVIDE 2 into 60
----------
n= 30 Simplify!

Your final answer for the first question is n= 30!

8 0

3 years ago

Please help! Will mark the brainliest!

dimaraw [331]

(f+g)(5)=33 is the answer

3 0

3 years ago

An employee worked 36 hours last week. This week, she worked 48 hours. Find the percent increase. Round to the nearest percent.

ioda

Answer:

There was a 25% increase.

Step-by-step explanation:

6 0

2 years ago

What is the area of this trapezoid

Zielflug [23.3K]

Answer:24

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers

He length of a rectangle is three times its width. The perimeter of the rectangle is at most 112 cm.

g100num [7]

The equation relating length to width
L = 3W
The inequality stating the boundaries of the perimeter
LW <= 112
When you plug in what L equals in the first equation into the second equation, you get
3W * W <= 112
evaluate
3W^2 <= 112
3W <= $4 \sqrt{7}$
W <= $\frac{4 \sqrt{7} }{3}$ cm

8 0

3 years ago

Read 2 more answers

what's the ratio of boys to girls in a class is 3:4 and if there are 12 boys in the class how many girls are ther​

what's the ratio of boys to girls in a class is 3:4 and if there are 12 boys in the class how many girls are ther