When dividing a number by 15, the quotient and remainder are both 6. What is the number?
用15去除一个数，商和余数都是6，这个数是多少．
<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<gadget id="calculator">90 + 6</gadget>
<output>96</output>

<result>96</result>