The difference between the two numbers of A and B is 70. (1/2) of number A is equal to (2/3) of number B. What is the number of A?
甲乙两数之差为70．甲数的(1/2)等于乙数的(2/3)，甲数是多少．
<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">70 / 1</gadget>
<output>70</output>

<gadget id="calculator">70 * 4</gadget>
<output>280</output>

<result>280</result>