Three people, A, B, and C save, A saves 240 yuan, B saves 70 yuan less than A, and C saves 80 yuan more than B. Find the average savings of ABC three people.
A、B、C三人储蓄，A储240元，B比A少储70元，C比B多储80元．求ABC三人平均储蓄额．
<gadget id="calculator">240 - 70</gadget>
<output>170</output>

<gadget id="calculator">170 + 80</gadget>
<output>250</output>

<gadget id="calculator">240 + 170 + 250</gadget>
<output>660</output>

<gadget id="calculator">660 / 3</gadget>
<output>220</output>

<result>220</result>