GMAT Problem Solving
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Source: OG11th
Level: 3
A poll reveals that the average (arithmetic mean) income of 10 households is $25,000. If 6 of the households have incomes of $30,000 each, what is the average income of the other 4 households?
- A 21500
- B 20500
- C 17500
- D 7500
- E 7000