For 4 consecutive natural numbers, the sum of the first three is 90, what is the sum of the last three.
连续的4个自然数，前三个的和是90，后3个的和是多少．
<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<gadget id="calculator">30 + 1</gadget>
<output>31</output>

<gadget id="calculator">31 * 3</gadget>
<output>93</output>

<result>93</result>