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Answer: 1.51
Step-by-step explanation:
[tex]\frac{w + 7.1}{3} =2.87[/tex]
[tex]3(\frac{w+7.1}{3})=3(2.87)[/tex]
w + 7.1 = 8.61
w + 7.1 - 7.1 = 8.61 - 7.1
w = 1.51