The ratio of A and B is 4:5. If B increases by 10, the quotient of A divided by B is (2/3). What is A?
甲、乙两数的比是4：5，如果乙数增加10，甲数除以乙数的商是(2/3)，甲数是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 10</gadget>
<output>20/3 = around 6.666667</output>

<gadget id="calculator">(2/3) * 5</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">4 - (10/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(20/3) / (2/3)</gadget>
<output>10</output>

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<result>40</result>