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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 results the ratio of the boys and girls became `7:6` .The number of boys who left the school is .

A

74

B

76

C

84

D

86

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