Every liter of milk contains (7/5) grams of calcium, and a bottle of milk contains (1/4) liters. How many grams of calcium does a bottle of milk contain?
每升牛奶含钙(7/5)克，一瓶牛奶有(1/4)升，一瓶牛奶大约含钙多少克．
<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(7/5) * (1/4)</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>