There is a starting formula, the sum of the dividend, the divisor, the quotient and the remainder is 100, the known quotient is 12, and the remainder is 5. Please find out how much the dividend is.
有一个出发算式，被除数、除数、商和余数的和是100，已知商是12，余数是5．请你求出被除数多少．
<gadget id="calculator">100 - 5 - 12 - 5</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>

<gadget id="calculator">72 + 5</gadget>
<output>77</output>

<result>77</result>