Solve for n
n = \frac{640}{21} = 30\frac{10}{21} \approx 30.476190476
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40\times 16=21n
Variable n cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 40n, the least common multiple of n,40.
640=21n
Multiply 40 and 16 to get 640.
21n=640
Swap sides so that all variable terms are on the left hand side.
n=\frac{640}{21}
Divide both sides by 21.
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