An ‘a' train leaves a subway station every 12 minutes. an ‘e' train leaves every 9minutes. if both trains just left the station on parallel tracks, when will both leave the station together again? a. in 108 minutes b. in 36 minutes c. in 72 minutes d. in 24 minutes

a.) list the factors of 40.

1/2/4/5/8/10/20/40

b.) list the factors of 40 that represent the number of cans that could be on each shelf.

5

c.) how many different arrangements of cans are possible?

just one because if you put more on one shelf you will go way over 40 and the cabinet will probably break.

d.) what are the possible arrangements of the cans?

put 5 cans on each self to reach 40 cans in total.

e.) which arrangement uses all the shelves?

5 because you can put 5 cans on each shelf, and since there are 8 shelfs you are equally going to get 40 cans.