It is known that the product of two outer terms of a proportional formula is 15, one inner term is (1/3), and the other inner term is what.
已知一个比例式的两外项之积是15，一个内项是(1/3)，另一个内项是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15 / (1/3)</gadget>
<output>45</output>

<result>45</result>