100:20+40

To solve the expression \(100:20+40\), we first interpret the colon (:) as division. Therefore, we rewrite it as:

\[ 100 \div 20 + 40 \]

Now, calculate \(100 \div 20\):

\[ 100 \div 20 = 5 \]

Next, add \(40\):

\[ 5 + 40 = 45 \]

So, the final result is \(45\).