Answer:
The answer is; 1250 skiers and 2500 snowboarders.
Step-by-step explanation:
The given ratio of 1:2 tells us that there is one skier to every two snow boarder.
Let the skier be represented by S.
Let the snowboarder be represented by B.
We can relate this condition as = 1:2 = S:B
Or we can say that 2S = B

=>
S = 1250
B = 2S = 
B = 2500
Answer is : 1250 skiers and 2500 snowboarders.