Divide 3 times a number by the sum of 3.75 and 2.5, the quotient is 0.3, find this number.
一个数的3倍除以3.75与2.5的和，商是0.3，求这个数．
<gadget id="calculator">3.75 + 2.5</gadget>
<output>6.25</output>

<gadget id="calculator">0.3 / 3</gadget>
<output>0.1</output>

<gadget id="calculator">6.25 * 0.1</gadget>
<output>0.625</output>

<result>0.625</result>