Answer:360
Explanation:
Let the profit of Jack be x , since Sam and Mark received twice as much of profit of Jack, then,
Sam's profit = 2x
Mark's profit = 2x
since the toatl profit = 1800 , then
x + 2x + 2x = 1800
5x = 1800
x = 1800/5
x= 360
Therefore Jack received 360