A, B, and C water flowers. A waters 68 pots, B waters 62 pots, and C waters 56 pots. It is known that there are 90 pots of flowers in total, how many pots of flowers are watered by all three people?
甲、乙、丙三人浇花，甲浇了68盆，乙浇了62盆，丙浇了56盆．已知共有花90盆，则三人都浇了的花有多少盆．
<gadget id="calculator">68 + 62</gadget>
<output>130</output>

<gadget id="calculator">90 - 56</gadget>
<output>34</output>

<gadget id="calculator">130 - 90 - 34</gadget>
<output>6</output>

<result>6</result>