Suguo Supermarket shipped 0.4 tons of cantaloupe and 2.7 tons more watermelon than the cantaloupe. How many tons did the two kinds of melons bring in total?
苏果超市运来哈密瓜0.4吨，西瓜比运来的哈密瓜多2.7吨，两种瓜一共运来多少吨？
<gadget id="calculator">0.4 + 2.7 + 0.4</gadget>
<output>3.5</output>

<result>3.5</result>