Answer:
Let's say Jack's earning is x, Janet's earning is y and Cindy's earning is z
So x + y + z = 65,901 and x = 2y and z = y + 5000
<=> 2y + y + y + 5000 = 65,901
<=> 4y = 65,901 - 5000
<=> 4y = 60,901
<=> y = 60,901 / 4 = 15,225.25
So x = 2 * 15,225.25 = 30,450.5 and z = 15,225.25 + 5000 = 20,225.25
So Jack's earning is $30,450.5, Janet's earning is $15,225.25 and Cindy's earning is $20,225.25
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