The school canteen used to eat (4/5) tons of rice, but ate (2/3) tons in the first 3 days, and finished eating the remaining 2 days. How many tons do the rest eat on average per day?
学校食堂原有(4/5)吨大米，前3天吃掉(2/3)吨，剩下的2天吃完．剩下的平均每天吃多少吨？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(4/5) - (2/3)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(2/15) / 2</gadget>
<output>1/15 = around 0.066667</output>

<result>1/15 = around 0.066667</result>