The sum of the two numbers of A and B is 140, the ratio of the two numbers of A and B is 4:3, what is the number of A?
甲乙两数的和是140，甲乙两数的比是4：3，甲数是多少．
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">140 * (4/7)</gadget>
<output>80</output>

<result>80</result>