甲数是乙数的3/7,丙数是甲数的5/7,则丙数是乙数的几分之几?

问题描述:

甲数是乙数的3/7,丙数是甲数的5/7,则丙数是乙数的几分之几?

甲X乙Y丙z
X=3/7Yz=5/7X所以z=5/7*(3/7Y)
z=15/49Y