The sum of the three numbers A, B, and C is 135, of which the number C is 45, and the ratio of A to B is 2:3, so what is B?
甲、乙、丙三个数的和是135，其中丙数是45，甲与乙的比是2：3，那么乙是多少
<gadget id="calculator">135 - 45</gadget>
<output>90</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">90 * (3/5)</gadget>
<output>54</output>

<result>54</result>