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Alex = A , Rob = R
A = 20
A = 1/4(R)
Substitute A = 20 into second equation
20 = 1/4(R)
Multiply both sides by 4
80 = R
Rob earned $80
I would show with a bar model of alex being one bar and Rob being four bars. If alex has a bar of 20- then Rob's four bars would be 80. So. 4(20) = 80
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