The sum of the dividend, divisor, quotient and remainder is 100. It is known that the quotient is 12 and the remainder is 5. What is the dividend?
被除数、除数、商和余数的和是100，已知商是12，余数是5，被除数是多少？
<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>