Question 1014197
a = number of workers total.
the number who work in the united states is .4 * a
the number who work outside the united states is 150.


.4a + 150 = a


subtract .4a from both sides of the equation to get 150 = a - .4a


simplify to get 150 = .6a


solve for a to get a = 150/.6 = 250


the total number of workers is 250.