(2/5) of number A is equal to (3/4) of number B. The sum of the two numbers of A and B is 69. What is the number of A?
甲数的(2/5)等于乙数的(3/4)，甲乙两数和是69，甲数是多少．
<gadget id="calculator">15 + 8</gadget>
<output>23</output>

<gadget id="calculator">69 / 23</gadget>
<output>3</output>

<gadget id="calculator">3 * 15</gadget>
<output>45</output>

<result>45</result>