78:6•3

To solve the expression \( 78 : 6 \cdot 3 \), we follow the order of operations, which states to perform division and multiplication from left to right.

1. First, divide \( 78 \) by \( 6 \): \[ 78 \div 6 = 13 \]

2. Next, multiply the result by \( 3 \): \[ 13 \cdot 3 = 39 \]

So, \( 78 : 6 \cdot 3 = 39 \).