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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.

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Q: How would you write a number sentence and solve this problem There are 4 209 participants in the race 2928 are girls the rest are boys How many boys are competing?
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