The number 15 less than (1/3) of a number is 75. What is this number?
比一个数的(1/3)少15的数是75，这个数是多少．
<gadget id="calculator">15 + 75</gadget>
<output>90</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">90 / (1/3)</gadget>
<output>270</output>

<result>270</result>