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प्रश्न
In a class of 60 children, 30% are girls. How many boys are there?
योग
उत्तर
Total children = 60,
Girls = 30%
∴Total girls = 30% of 60 = `60 xx 30/100 = 18`
∴ No. of boys = 60 – 18 = 42
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