The sum of A and C is 161, A:B=2:3, B:C=4:5, so what is the number of A
甲、丙两数的和是161，甲：乙=2：3，乙：丙=4：5，那么甲数是多少
<gadget id="calculator">8 + 15</gadget>
<output>23</output>

<gadget id="calculator">8 / 23</gadget>
<output>8/23 = around 0.347826</output>

<gadget id="calculator">161 * (8/23)</gadget>
<output>56</output>

<result>56</result>