(21005+43120+103025):15

To solve the expression \((21005 + 43120 + 103025) : 15\), we first add the numbers together.

1. Calculate the sum: \[ 21005 + 43120 + 103025 = 167150 \]

2. Now divide the sum by 15: \[ 167150 \div 15 = 11143.3333\ldots \]

So, \((21005 + 43120 + 103025) : 15\) is approximately \(11143.33\) (to two decimal places).