45*36+how much*64=4500.
45*36+多少*64=4500．
<gadget id="calculator">45 * 36</gadget>
<output>1_620</output>

<gadget id="calculator">4_500 - 1_620</gadget>
<output>2_880</output>

<gadget id="calculator">2_880 / 64</gadget>
<output>45</output>

<result>45</result>