The sum of five numbers is 555. The average of first two numbers is 75 and the third number is 115. What is the average of last two numbers?
Answer: 145
Explanation
The sum of five numbers is 555.
The average of the first two numbers is 75, so their sum is 2 x 75 = 150.
The third number is 115.
So, the sum of the first three numbers is 150 + 115 = 265.
Since the sum of all five numbers is 555, the sum of the last two numbers is 555 - 265 = 290.
Therefore, the average of the last two numbers is 290 / 2 = 145.
The correct answer is: 145
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