The clothing processing group has 240 meters of cloth. After making 50 sets of children's clothing, there are 90 meters left. How many meters of cloth are used for each set of children's clothing?
服装加工组有240米布，做了50套儿童服装后，还剩90米，平均每套儿童服装用布多少米？
<gadget id="calculator">240 - 90</gadget>
<output>150</output>

<gadget id="calculator">150 / 50</gadget>
<output>3</output>

<result>3</result>