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100 boys.

Ratio boys to girls is 2:3 ⇒ 2 parts are boys, 3 parts are girls. So there are 2 + 3 = 5 parts in all.

250 people ÷ 5 parts = 50 people per part

Boys: 2 parts x 50 people per part = 100 boys

Girls: 3 parts x 50 people per part = 150 girls

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