Subtract 33 from a natural number, multiply by 4, and then divide by 7. The quotient obtained is 31 with a remainder. What is the original natural number?
将一个自然数减去33，然后乘以4，再除以7，所得的商是31，且有余数，原来的自然数是多少．
<gadget id="calculator">220 / 4</gadget>
<output>55</output>

<gadget id="calculator">55 + 33</gadget>
<output>88</output>

<result>88</result>