1.

The ratio of boys and girls in the school is 7 : 9. When 22 new boys are joined in this school then the ratio become 9 : 10. How many girl in this school?1. 1802. 2003. 1604. 1705. 220

Answer» Correct Answer - Option 1 : 180

Given:

The ratio of boys and girls  =  7 : 9

Number of new boys = 22

New boys to girls ratio = 9 ∶ 10

Calculation:

Let be boys = 7x and girls be = 9x

⇒ {(7x+ 22)/9x} = 9/10

⇒ 70x + 220 = 81x

⇒ 11x = 220 

⇒ x = 20

Then put the value in Girls 

⇒ Girls =  20× 9 = 180 

∴ Girls are 180



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