Mom went to the store to buy peanut oil and spent 64.5 yuan, and bought eggs for 12.5 yuan. He paid 100 yuan, how much should he get back?
妈妈到商店买花生油用去64.5元，买鸡蛋用去12.5元．他付了100元钱，应找回多少钱？
<gadget id="calculator">64.5 + 12.5</gadget>
<output>77</output>

<gadget id="calculator">100 - 77</gadget>
<output>23</output>

<result>23</result>