The ratio of A and B is 5:3. The sum of their greatest common divisor and least common multiple is 240. What is their difference?
甲、乙两数的比是5：3，它们的最大公约数与最小公倍数的和是240，它们的差是多少．
<gadget id="calculator">240 / 16</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>