All categories

3 years ago

The ratio of boys to girls at a school is 9 to 11. If 400 students attend the school, how many are girls?

Mathematics

2 answers:

pentagon [3]3 years ago

6 0

Total ratio=9+11=20
number of girls=11/20*400
=220

xxTIMURxx [149]3 years ago

3 0

Answer: 220

Step-by-step explanation:

Given : The ratio of boys to girls at a school is 9 to 11.

Let the number of boys be 9x and the number of girls be 11x.

Since there are 400 students attend the school.

Then we have the following equation :-

$9x+11x=400\\\\\Rightarrow\ 20x=400\\\\\Rightarrow\ x=\dfrac{400}{20}=20$

Now, the number of girls = 11x = 11(20)=220

Hence, there are 220 girls.

You might be interested in

How to know if a function is increasing or decreasing

Shkiper50 [21]

Answer: when looking at the graph, anything that is going down is decreasing and anything that is going up is increasing. Maybe that can help you.

Step-by-step explanation:

3 0

3 years ago

Solve the system of equations below by graphing.

AleksandrR [38]

I think it would be B hope it helps

5 0

4 years ago

Read 2 more answers

14/38 simplified? Thanks!

ira [324]

14/38 simplified would be 7/19

5 0

3 years ago

11th grade geometry:

Aliun [14]

Answer:

The perimeter is 72 units and the area is 149 square units.

Step-by-step explanation:

$\triangle SBA$ has coordinates $S(15,-8),B(-2,21)$ and $A(0,0)$

Using the distance formula.........

Length of side $SB = \sqrt{(15+2)^2+(-8-21)^2}= \sqrt{17^2+(-29)^2}= \sqrt{1130}$

Length of side $BA= \sqrt{(-2)^2+(21)^2}= \sqrt{445}$

Length of side $AS =\sqrt{(15)^2+(-8)^2}=\sqrt{289}=17$

So, the perimeter of the triangle will be: $(SB+BA+AS)= \sqrt{1130}+ \sqrt{445}+17 =71.71... \approx 72$ units. (Rounded to the nearest unit)

The height of the triangle for the corresponding base $SB$ is 8.89 units.

Formula for the Area of triangle, $A= \frac{1}{2}(base\times height)$

So, the area of the $\triangle SBA$ will be: $\frac{1}{2}(\sqrt{1130}\times 8.89)= 149.42... \approx 149$ square units. (Rounded to the nearest unit)

3 0

3 years ago

Please help me out I really need this asap

Sever21 [200]

Answer:

200

Step-by-step explanation:

8 0

3 years ago