The fifth and sixth grade students actively participated in resource recycling activities. The sixth grade students recycled 1.5 tons of waste paper, and the fifth grade students recycled 1.5 tons of waste paper (4/5). How much waste paper did the two grade students recycle in total? Ton?
五、六年级同学积极参加资源回收活动，六年级同学回收废纸1.5吨，五年级同学回收的废纸吨数是六年级的(4/5)，这两个年级的同学共回收废纸多少吨？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1.5 * (4/5)</gadget>
<output>1.2</output>

<gadget id="calculator">1.2 + 1.5</gadget>
<output>2.7</output>

<result>2.7</result>