Current location - Training Enrollment Network - Mathematics courses - There are 187 red beads, white beads and black beads in primary school mathematics. How many blacks are there in the order of four reds, three whites and two blacks?
There are 187 red beads, white beads and black beads in primary school mathematics. How many blacks are there in the order of four reds, three whites and two blacks?
Solution: The number of beads in each group * * *: 4+3+2=9.
187 number of bead * * * groups: 187 ÷ 9 = 20 ...
There are no black beads among the remaining seven beads.