The sum of the numbers A and B is 144. It is known that the number A is (5/7) of the number B, so what is the number A?
甲、乙两数的和是144，已知甲数是乙数的(5/7)，那么甲数是多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 + (5/7)</gadget>
<output>12/7 = around 1.714286</output>

<gadget id="calculator">144 / (12/7)</gadget>
<output>84</output>

<gadget id="calculator">84 * (5/7)</gadget>
<output>60</output>

<result>60</result>