Question

In a class of 42 students the number of boys is 2/5 of girls find the number of boys and girls

Answer 1

Step-by-step explanation:

1)  

B

+

G

=

42

(2)  

B

=

2

5

×

G

Replacing  

B

by (2) we get:

2

5

×

G

+

G

=

1

2

5

×

G

=

42

Turning  

1

2

5

into a non-mixed fraction:

7

5

×

G

=

42

→

multiply by 5, divide by 7:

G

=

42

×

5

7

=

6

×

7

×

5

7

=

30

B

=

2

5

×

30

=

2

5

×

5

×

6

=

12

And these add up to 42.

Answer 2

Answer:

there are 12 boys, and 30 girls

Step-by-step explanation:

there are these numbers becuase the ratio between boys and girls is 2 and 5, which is 7. 42/7 is 6, so 6 times the number of people, (2, and 5) is 12 boys and 30 girls.