Solve for b
b=\frac{40}{63}\approx 0.634920635
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b=\frac{5}{9}\times \frac{8}{7}
Multiply both sides by \frac{8}{7}, the reciprocal of \frac{7}{8}.
b=\frac{5\times 8}{9\times 7}
Multiply \frac{5}{9} times \frac{8}{7} by multiplying numerator times numerator and denominator times denominator.
b=\frac{40}{63}
Do the multiplications in the fraction \frac{5\times 8}{9\times 7}.
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