Solve for x
x=144
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1800=12.5x
Multiply 90 and 20 to get 1800.
12.5x=1800
Swap sides so that all variable terms are on the left hand side.
x=\frac{1800}{12.5}
Divide both sides by 12.5.
x=\frac{18000}{125}
Expand \frac{1800}{12.5} by multiplying both numerator and the denominator by 10.
x=144
Divide 18000 by 125 to get 144.
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