□-□=27, if both the minuend and the subtrahend are two-digit numbers, how many equations should the difference be 27?
□-□=27，如果规定被减数和减数都是两位数，请问差为27的算式应有多少道．
<gadget id="calculator">10 + 27</gadget>
<output>37</output>

<gadget id="calculator">99 - 37</gadget>
<output>62</output>

<gadget id="calculator">62 + 1</gadget>
<output>63</output>

<result>63</result>