Question

please help me in this question

Answer 1

Answer:

110 & 40

48

Step-by-step explanation:

As ratio is 2 : 5, let the numbers are 2a and 5a.

Here,

 Difference between them = 66

⇒ 5a - 2a = 66

⇒ 3a = 66

⇒ a = 66/3 = 22

Hence, numbers are :

   5a = 5( 22 ) = 110

   2a = 2( 22 ) = 44

                    Question 2 :

Ratio of no. of boys to girls is 7 : 5, so let number of boys be 7a and that of girls be 5a.

Here, number of boys is 8 more than that of girls so :

⇒ no. of boys = no. of girls + 8

⇒ 7a = 5a + 8

⇒ 7a - 5a = 8

⇒ 2a = 8

⇒ a = 8/2 = 4

     Total strength = no. of boys + no. of girls

            = 7a + 5a

            = 12a

            = 12( 4 ) = 48

Answer 2

Answer:

2. Number of girls = 5x

Number of boys = 5x + 8

Value of x =

5x + 8 = 7x

8 = 7x - 5x

8 = 2x

8/2 = x

4 = x

now , no. of girls = 5 ×4 = 20

no. of boys = 7 × 4 = 28

Total strenght = 48