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The total strength of a city is 10000. The number of boys and girls increased by 20% & 25% respectively and consequently the strength of the town becomes 12200. What was the number of boys in a city?

A6000

B4500

C4000

D4800

Answer:

A. 6000

Read Explanation:

Let the number of boys be x Then number of females = (10000 –x) 20% of x +25% of (10000 –x) = (12200-10000)= 2200 20x/100+25/100(10000-x) = 2200 30000 = 5x x = 6000


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