The school has 248 balls. There are 3 classes in the third grade. Each class borrows 35 balls. How many are left?
学校有皮球248个，三年级有3个班，每班借去35个，还剩多少个？
<gadget id="calculator">3 * 35</gadget>
<output>105</output>

<gadget id="calculator">248 - 105</gadget>
<output>143</output>

<result>143</result>