Two furniture factories, A and B, produce single-person desks and chairs of the same specification. Since A and B have different specialties, factory A spends (3/5) time producing desks and (2/5) time each month. Production of school chairs can produce 900 sets of desks and chairs per month; Factory B spends (2/3) of the time producing desks and (1/3) of the time producing school chairs per month and can produce 1500 sets of desks and chairs per month tables and chairs. Now the joint production of the two factories, through reasonable arrangements, try to give full play to their respective strengths. How many more sets of desks and chairs can the two factories produce per month than in the past?
甲、乙两个家具厂生产同一规格的单人课桌、椅，由于甲、乙两厂特长不同，甲厂每月用(3/5)的时间生产课桌，(2/5)的时间生产课椅，每个月可生产900套课桌椅；乙厂每月用(2/3)的时间生产课桌，(1/3)的时间生产课椅，每个月可生产1500套课桌椅．现在两厂联合生产，经过合理安排，尽量发挥各自特长．现在两厂每月比过去可多生产课桌椅多少套？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<gadget id="calculator">1_500 / 10</gadget>
<output>150</output>

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

<gadget id="calculator">30 * (3/5)</gadget>
<output>18</output>

<gadget id="calculator">900 / 18</gadget>
<output>50</output>

<gadget id="calculator">50 / 3</gadget>
<output>50/3 = around 16.666667</output>

<gadget id="calculator">150 * (50/3)</gadget>
<output>2_500</output>

<gadget id="calculator">2_500 - 900 - 1_500</gadget>
<output>100</output>

<result>100</result>