The canteen used 70.5 tons of water in October, 7.8 tons more than in September. How many tons of water are used in two months?
食堂中十月份用水70.5吨，比九月份多7.8吨，两个月一共用水多少吨？
<gadget id="calculator">70.5 - 7.8</gadget>
<output>62.7</output>

<gadget id="calculator">62.7 + 70.5</gadget>
<output>133.2</output>

<result>133.2</result>