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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 |
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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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