There is a division formula, the sum of the dividend, the divisor and the quotient is 90, the known quotient is 12, what is the dividend.
有一道除法算式，被除数、除数与商的和是90，已知商是12，被除数是多少．
<gadget id="calculator">90 - 12</gadget>
<output>78</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<gadget id="calculator">78 / 13</gadget>
<output>6</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<result>72</result>