If the difference and quotient of two numbers A and B are both (7/5), what is A's number?
甲、乙两数的差与商都是(7/5)，则甲数是多少．
<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">(7/5) - 1</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(7/5) / (2/5)</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">(7/5) * (7/2)</gadget>
<output>49/10 = around 4.9</output>

<result>49/10 = around 4.9</result>