Question

In a class of 42 students, the number of boys is 2/5 of the girls. Find the number of boys and girls in the class​

Answer 1

Ответ:

Let's use algebra to solve the problem.

Let's represent the number of girls in the class as "G". We know that the number of boys is 2/5 of the girls, so we can represent the number of boys as 2/5G.

We also know that the total number of students in the class is 42. So, we can write an equation based on this information:

G + 2/5G = 42

Simplifying the equation:

7/5G = 42

Multiplying both sides by 5/7:

G = 30

So there are 30 girls in the class.

To find the number of boys, we can substitute G = 30 into the expression we got earlier:

2/5G = 2/5(30) = 12

So there are 12 boys in the class.

Therefore, there are 30 girls and 12 boys in the class.

Пошаговое объяснение:

Надеюсь помог

Answer 2

Ответ: 30+12

Пошаговое объяснение: девочек Х, мальчиков 2/5 Х

Х+2\5*Х=42; Х=30 (девочки), мальчики 2/5*30=12

Answer 3

Let's assume the number of girls in the class is x.

According to the given information, the number of boys is 2/5 of the girls. Therefore, the number of boys is (2/5)x.

The total number of students in the class is given as 42. So, the sum of the number of boys and girls should equal 42:

x + (2/5)x = 42

To solve the equation, we need to simplify it:

(5/5)x + (2/5)x = 42

(7/5)x = 42

Now, we can solve for x by multiplying both sides of the equation by the reciprocal of (7/5), which is (5/7):

x = 42 * (5/7)

x = 30

Therefore, the number of girls in the class is 30.

To find the number of boys, we can substitute the value of x back into the equation for the number of boys:

Number of boys = (2/5)x = (2/5) * 30 = 12

Hence, there are 12 boys and 30 girls in the class.