A savings bank collected 240,000 yuan in deposits in March, 180,000 yuan more in April than March, and 120,000 yuan less in May than March. How much is the average monthly deposit for this savings bank?
一个储蓄所，三月份收存款240000元，四月份比三月份多收180000元，五月份比三月份少收120000元，这个储蓄所平均每月收存款多少元？
<gadget id="calculator">240_000 - 120_000</gadget>
<output>120_000</output>

<gadget id="calculator">240_000 + 240_000 + 180_000 + 120_000</gadget>
<output>780_000</output>

<gadget id="calculator">780_000 / 3</gadget>
<output>260_000</output>

<result>260_000</result>