math problem

Question

in 2012 summer olympics, new zealand won more gold medals than cuba, who won more gold medals than jamaica, if the number of gold medals won by these three countries in three consecutive integers whosw sum is 15, find the number of gold medals won by each.

Answer 1

x+x+1+x+2=15

3x+3=15

3x=15-3

3x=12

x=12/3

x=4 Jamaica

x+1=5 Cuba

x+2=6 New Zealand

or,...15/3=5, which is the mean and the middle number

5-1=4

5+1=6