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4 years ago

1/3 of a class are girls.

Mathematics

1 answer:

Elenna [48]4 years ago

6 0

Ratio of girls to boys is (1/3*X) / (2/3*X).

That is, 1:2

Similarly, ratio of boys to girls is (2/3*X) / (1/3*X).

That is, 2:1

Step-by-step explanation:

Assume, total Number of students in the class is X. Since, 1/3 part of the class is girls, this makes 2/3 part of the class boys.
Total number of girls will be equal to 1/3 *X. Total number of boys is equal to 2/3*X.
So, ratio of girls to boys is (1/3*X) / (2/3*X). That is, 1:2. Similarly, ratio of boys to girls is (2/3*X) / (1/3*X). That is, 2:1

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lesya692 [45]

Answer:

$S=720$

Step-by-step explanation:

From the question we are told that

Six wire are attached to a circuit board

Generally using multiplication rule

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5 0

3 years ago

Twenty percent of 150 is

Svetlanka [38]

20% of 150 is 30

Change the percentage into a decimal by dividing it over 100:

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Multiply:

0.2 × 150 = 30

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3 years ago

What is 656,32.25 in expanded form

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3 years ago

A boy is 6 years older than his sister. In three years time he will be twice her age. What

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Answer:

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3 0

3 years ago

It takes 12 hours for 7 men to paint a room.

dangina [55]

28 men are needed to paint the room in 3 hours

<h3><u>Solution:</u></h3>

Given that it takes 12 hours for 7 men to paint a room

We are asked to find number of men required to paint the room in 3 hours

Recognize, "paint the room" is 1 task. One job.

7 men -------- 12 hours ------ 1 job

(7/7) = 1 men ------- 12 x 7 (84) ------- same 1 job

The one men is rate is 84 hours to do the job

We can express this as 1/84 jobs per hour, the one-person rate

Now lets find how many men needed to paint the room in 3 hours

Let the required number of men for 3 hours be "a"

The rates of each person is simply additive.

$a \times \frac{1}{84} \times 3 = 1$

corresponds to rate x hours = jobs and "a" is a variable for how many men

$a \times \frac{1}{28} = 28$

Thus 28 men are needed to paint the room in 3 hours

4 0

3 years ago