$20 \cdot \frac{j}{j + 4} = \frac{20 j}{j + 4}$

Explanation

$20 \cdot \frac{j}{j + 4} \overset{◯}{1} \frac{20 j}{j + 4}$
①	Multiply $20$ by $\frac{j}{j + 4}$ to get $\frac{20 j}{j + 4}$ . Step 1: Write $20$ as a fraction by putting $1$ in the denominator. Step 2: Multiply numerators and denominators. Step 3: Simplify numerator and denominator. $20 \cdot \frac{j}{j + 4} Step 1 \frac{20}{1} \cdot \frac{j}{j + 4} Step 2 \frac{20 \cdot j}{1 \cdot ( j + 4 )} = Step 3 \frac{20 j}{j + 4}$

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20⋅j+4j​=j+420j​

$20 \cdot \frac{j}{j + 4} = \frac{20 j}{j + 4}$