The supermarket bought 45 boxes of toothpaste and 30 boxes of toothbrushes for a total of 5,850 yuan. Each box of toothbrush is 90 yuan. How much is each box of toothpaste?
超市买来45箱牙膏和30箱牙刷共5850元，每箱牙刷90元，每箱牙膏多少元？
<gadget id="calculator">30 * 90</gadget>
<output>2_700</output>

<gadget id="calculator">5_850 - 2_700</gadget>
<output>3_150</output>

<gadget id="calculator">3_150 / 45</gadget>
<output>70</output>

<result>70</result>