A number is increased by (1/5), then it is 4.8m, what is (9/10) of this number.
一个数增加(1/5)，以后是4.8m，这个数的(9/10)是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">4.8 / (6/5)</gadget>
<output>4</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">4 * (9/10)</gadget>
<output>18/5 = around 3.6</output>

<result>18/5 = around 3.6</result>