SSC CGL Tier II 25 Oct 2015 Paper 1

Question : 50 of 100

Marks: +1, -0

In a school there were 1554 students and the ratio of the number of the boys and girls was 4 : 3. After a few days, 30 girls joined the school but a few boys left; as a result the ratio of the boys and girls became 7 : 6. The number of boys who left the school is

Validate

Solution:

(1) In the school,
Boys

⇒{4}/{7} × 1554=888

Girls

⇒{3}/{7} × 1554=666

After 30 days,
Girls = 666 + 30 = 696
If x boys leave the school,
then,
According to the question,

{888-x}/{696}= {7}/{6}

⇒{888-x}/{116}=7

⇒ 888-x=116×7=812

⇒ x=888-812=76

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