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Let b be the number of boys, then:
girls + boys = total
→ 2928 +b = 4209
This is your number sentence, which is solved using algebra collecting numbers on one side and the letter on the other:
2928 + b = 4209
→(2928 - 2928) + b = 4209 - 2928
→ b = 1281
→ there are 1281 boys competing.
What else can I help you with?
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