解:设蓝色的球为x个,那么黄色的为(1+1/9)x个,红色的为(1+1/9)(1+1/5)x个,根据题意,得x+(1+1/9)x+(1+1/9)(1+1/5)x=93 x+10/9x+10/9×6/5x=93 31/9x=93 x=27(1+1/9)(1+1/5)×27=36(个)答:红色的球有36个。