How will the product be if one factor is reduced by 2 times and the other is increased by 10 times?

Suppose we have the product of two factors a and b, the product of which is equal to ab. Then, when the first factor is reduced by half, it will be equal to a / 2, and the second, when increased by 10 times, will be 10b. We get the following expression.
(a / 2) * 10b
Denominator 2 cancels out and we get
a * 5b = 5ab
Answer. The work will be enlarged 5 times.

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