Solve for b
b=32
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4\times 40=5b
Multiply both sides of the equation by 100, the least common multiple of 25,20.
160=5b
Multiply 4 and 40 to get 160.
5b=160
Swap sides so that all variable terms are on the left hand side.
b=\frac{160}{5}
Divide both sides by 5.
b=32
Divide 160 by 5 to get 32.
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