If the numerator of ((a)/5) is expanded by 3 times, this fraction is equal to 2(2/5), then a=how much.
如果把((a)/5)的分子扩大3倍，这个分数等于2(2/5)，那么a=多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<result>4</result>