The easiest way to solve this is to write the words mathematically. You're told that the product of 4 and a number, b = 3/5.
That means:
4b (product of 4 and b) = [tex] \frac{3}{5} [/tex]
To solve for b, you want to divide both sides by 4 to get the b by itself on the left of the equation:
[tex]4b = \frac{3}{5}\\
\frac{4b}{4} = \frac{\frac{3}{5}}{4}\\
b = \frac{3}{20} [/tex]
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Answer: b = 3/20
