GRE Problem Solving Question 551
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Source: Magoosh
The average (arithmetic mean) of four numbers is 4a + 16. When a fifth number is added, the average becomes 5*a + 20. The fifth number is
- A a-4
 - B a+4
 - C 4*a+4
 - D 4*a+16
 - E 9*a+36
 
