Jeff, James and Kyle are business partners and have to share a profit of $168000.

How much do each get if the profit ratio is 5:4:3

Let's use the variable x to determine each person's share. We know that the ratio is 5x:4x:3x, and that means that

5x + 4x + 3x = 168,000
12x = 168,000
x = 168,000 / 12
x = 14,000

And since the ratio is 5x:4x:3x, that means the amounts are
70,000 : 56,000 : 42,000.