Solve for q
q=\frac{21}{40}=0.525
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q=\frac{3}{5}\times \frac{7}{8}
Multiply both sides by \frac{7}{8}.
q=\frac{3\times 7}{5\times 8}
Multiply \frac{3}{5} times \frac{7}{8} by multiplying numerator times numerator and denominator times denominator.
q=\frac{21}{40}
Do the multiplications in the fraction \frac{3\times 7}{5\times 8}.
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