6 plus (1/5) of a number is equal to 7, what should be the number.
6加上一个数的(1/5)等于7，这个数应是多少．
<gadget id="calculator">7 - 6</gadget>
<output>1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<result>5</result>