The orchard bought 6 bags of pesticides, each bag was 25 kilograms, and after part of the insecticide was used, there was still 45 kilograms left. How many kilograms of pesticides are used to kill insects?
果园买到6袋农药，每袋25千克，杀虫用去一部分后，还剩45千克．杀虫用去农药多少千克？
<gadget id="calculator">25 * 6</gadget>
<output>150</output>

<gadget id="calculator">150 - 45</gadget>
<output>105</output>

<result>105</result>