j/4 = 3

To solve the equation \( \frac{j}{4} = 3 \), follow these steps:

1. Multiply both sides of the equation by 4 to eliminate the fraction:

\[
j = 3 \times 4
\]

2. Calculate the right side:

\[
j = 12
\]

So, the solution is \( j = 12 \).