70•40:28

To solve the expression \(70 \cdot 40 \div 28\), you can follow these steps:

1. First, multiply \(70\) by \(40\): \[ 70 \cdot 40 = 2800 \]

2. Next, divide the result by \(28\): \[ 2800 \div 28 = 100 \]

Therefore, the final answer is \(100\).