All categories

3 years ago

The ratio of boys to girls in the class is 4 to 5. If there are 18 boys and girls in the

Mathematics

2 answers:

bearhunter [10]3 years ago

7 0

Answer:

8 boys and 10 girls

Step-by-step explanation:

If the ratio is 4:5,

4x2 + 5x2 equal 8+10 =

18.

4:5=8:10

Grace [21]3 years ago

6 0

Answer:

8 boys

10 girls

Step-by-step explanation:

4:5

8:10

8+10=18

You might be interested in

If f(x)=√x+12 and g(x)=2√x, what is the value of (f – g)(144)?

BaLLatris [955]

I hope this helps you

3 0

3 years ago

The bar diagram represents 24 hours in one day and shows a mark at 30%If you sleep 30% of the day, how many hours do you sleep?

horrorfan [7]

Let:

100%---------------->24h

30%------------------>xh

Using cross multiplication:

$\begin{gathered} \frac{100}{30}=\frac{24}{x} \\ solve_{\text{ }}for_{\text{ }}x\colon \\ x=\frac{30\cdot24}{100} \\ x=\frac{720}{100}=7.2h \end{gathered}$

8 0

1 year ago

a repairman purchased several furnace-blower motors for a total cost of $280 of his cost per motor has been $5 less, he could ha

nika2105 [10]

Answer:

It would be 550 because 280 - 5 = 275 and if he buys a new 1 it would cost the same and you add both

Step-by-step explanation:

4 0

3 years ago

Researchers want to investigate if students retain more information if it printed on blue paper rather than white paper. They re

Debora [2.8K]

Answer:

Stratified design with color of paper as the blocks

Step-by-step explanation:

The experimental design that this question uses is the stratified design with color of paper as the blocks

A stratified design is one where the population has been divided into strata that are homogeneous. A good number of participants would then be picked for each of the stratum. The homogeneous strata are also known as the blocks and here in this question we have color of paper as the block here.

The students are of different school levels, elementary, high school and middle school. Each of these levels have 100 students. The students in each levels are halved and each half is randomly assigned information on either a white paper or a blue paper.

5 0

3 years ago

Two cars, 540 kilometers apart, begin driving toward each other on a long, straight highway. one car travels 75 kilometers pe

Elodia [21]

One car travels at a speed of 75 kilometers per hour and the other car travels at a speed of 105 kilometers per hour.

Since both the cars are travelling towards each other their combined speed will be: 75+105=180 km/h.

Now, since the distance between the cars to start with is 540 km. Therefore, the time taken before the cars collide is:

$t=\frac{540}{180} =3$ hours.

Now, the speed of the canary is 100 km/h.

Therefore, the Canary flies flies for (100 km/h)x(3 hours) = 300 km before the cars collide.

5 0

3 years ago