The average of the two numbers A and B is 150, the ratio of A and B is 3:2, how much less is the number B than A.
甲、乙两数的平均数是150，甲、乙两数的比是3：2，乙数比甲数少多少．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">150 * (2/5)</gadget>
<output>60</output>

<result>60</result>