设甲车间纯迅斗有X人,则乙车间有(7/5)X人,根做磨据题意(X+5)/[(7/5)X-5]=4/55X+25=(7/5)X*4-2025X+125=28X-100225=3XX=75乙昌握车间人数为(7/5)*75=15*7=105