Solution
Total number of boys = 30 + 30 + 25 + 30 + 40 + 20 = 175
Total number of girls = 30 + 35 + 10 + 10 + 30 + 40 = 155
=> Required ratio = $$\frac{175}{155}$$
= 35 : 31
=> Ans - (B)
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