(3/4) of a number is 30, the formula for finding this number is. How many
一个数的(3/4)是30，求这个数的算式是．多少
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">30 / (3/4)</gadget>
<output>40</output>

<result>40</result>