设甲箱粉笔有x盒,则乙箱粉笔有(1/4)x盒
x-12=(3/2)[(1/4)x-12]
2x-24=3(1/4)x-36
x=48(盒)
48×(1/4)=12(盒)
48+12=60(盒)
答:两箱粉笔共60盒