The sum of dividend, divisor and remainder is 1600, given that the divisor is 20 and the remainder is 10, what is the quotient?
被除数、除数和余数的和是1600，已知除数是20，余数是10，那么商是多少．
<gadget id="calculator">1_600 - 20 - 10</gadget>
<output>1_570</output>

<gadget id="calculator">1_570 - 10</gadget>
<output>1_560</output>

<gadget id="calculator">1_560 / 20</gadget>
<output>78</output>

<result>78</result>