Q.15. In a class of 500 students, the number of boys equals to the number of girls, if -1/5 of the girls left the class and 25 boys joined in, what is the ratio of the number of boys to the number of girls, now? (a) 3:2 (b)12:7 (c) 11:8 (d) 9: 8
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Explanation:
Total Students = 500
so , Girls = 250
Boys =250
1/5 th of girls left the class
250×1/5 = 50
Girls = 250-50
= 200
25 boys Joined
Boys = 250+25
= 275
Ratio of Boys : Girls
Boys : Girls = 275/200
= 11:8
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