Discussion

Explanation:

Let the number of boys be b.

Hence, the number of girls is b/7 (1427% = 17)

Then, from the problem,

b7 + b = 560

⇒ 8b/7 = 560

⇒ b = 490

⇒ No. of girls = 560 – 490 = 70

Hence, option (b).

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