3 times of a number plus 15 times of this number is 432, what is this number?
一个数的3倍加上这个数的15倍是432，这个数是多少．
<gadget id="calculator">3 + 15</gadget>
<output>18</output>

<gadget id="calculator">432 / 18</gadget>
<output>24</output>

<result>24</result>