Question
There were thrice as many boys as girls in a gathering. After 15 boys had left the party and another 25 girls had joined the party, there was an equal number of boys and girls in the end. Find the number of boys at first.
4 m

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There were thrice as many boys as girls in a gathering. After 15 boys had left the party and another 25 girls had joined the party, there was an equal number of boys and girls in the end. Find the number of boys at first.