The canteen brings (9/4) tons of coal, uses (1/3) in the first week, and uses (3/5) tons in the second week. How many tons are shared in two weeks?
食堂运来(9/4)吨煤，第一周用去(1/3)，第二周用去(3/5)吨．两周共用去多少吨？
<gadget id="calculator">9 / 4</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(9/4) * (1/3)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/4) + (3/5)</gadget>
<output>27/20 = around 1.35</output>

<result>27/20 = around 1.35</result>