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In a school there were 1554 students and...

In a school there were `1554` students and the ratio of the number of the boys and girls was `4 : 3` .After few days, `30` girls joined the school but 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

A

76

B

84

C

86

D

74

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