The New Year is coming, and my mother goes to the supermarket to prepare for the New Year. The newly purchased chairs cost 68 yuan each, and my mother returned 42 yuan to the cashier for 450 yuan. How many new chairs did mom buy?
新年就要到了，妈妈去超市准备年货．新购置的椅子每把68元，妈妈给收银员450元找回了42元．妈妈买了几把新椅子？
<gadget id="calculator">450 - 42</gadget>
<output>408</output>

<gadget id="calculator">408 / 68</gadget>
<output>6</output>

<result>6</result>