Answer:
A, 5 days
Explanation:
Let's set the number of days as x. Then, the amount of money each person earned is:
Chris: 75 * x
Pat: 50 * x + 125
Then, because these are equal amounts,
75x = 50x + 125
Subtract 50x from both sides.
25x = 125
Divide both sides by 25.
x = 5
So, they worked for 5 days, or option A.