90:45+90:30

To solve the expression \(90:45 + 90:30\), we first interpret the colons as ratios.

1. Calculate each ratio: \[ \frac{90}{45} = 2 \] \[ \frac{90}{30} = 3 \]

2. Now, add the results together: \[ 2 + 3 = 5 \]

Thus, \(90:45 + 90:30 = 5\).