In a school,there were 1554 students and the | vedclass

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(D) Initially,the total number of students is $1554$ and the ratio of boys to girls is $4:3$.Total parts $= 4 + 3 = 7$.Number of boys $= (4/7) 	imes

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$76$

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(D) Initially,the total number of students is $1554$ and the ratio of boys to girls is $4:3$.Total parts $= 4 + 3 = 7$.Number of boys $= (4/7) 	imes 1554 = 888$.Number of girls $= (3/7) 	imes 1554 = 666$.After $30$ girls joined,the new number of girls $= 666 + 30 = 696$.Let the number of boys who left be $x$.Then,the new number of boys $= 888 - x$.According to the problem,the new ratio of boys to girls is $7:6$,so:$(888 - x) / 696 = 7 / 6$.Multiplying both sides by $696$:$888 - x = (7 / 6) 	imes 696$.$888 - x = 7 	imes 116$.$888 - x = 812$.$x = 888 - 812 = 76$.Therefore,$76$ boys left the school.

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

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