Zack, teri, and paco combined the foreign stamps from their collections for a stamp show. out of their collections. 3/10 of zacks stamps. 5/6 of teri's stamps and 3/8 of pacos stamps were from foreign countries. how many stamps were in their display

The complete question in the attached figure

Let 
Z---------------- > number of zacks stamps collections  for a stamp show
T---------------- > number of teri's stamps collections  for a stamp show
P--------------- > number of pacos  stamps collections  for a stamp show
we know that
Z=(3/10)*30-----------> Z=9
T=(5/6)*18------------ > T=15
P=(3/8)*24------------->P=9

the answer is
number of zacks stamps collections  for a stamp show was 9
number of teri's stamps collections  for a stamp show was 15
number of pacos  stamps collections for a stamp show was 9
In their display were 33 stamps