Question
The average of five even numbers is 38. If we replace
two of these even numbers, 88 and 92, with a single even number X, the new average decreases by 4. What is the value of X?Solution
Sum of 5 even numbers = 5 x 38 = 190 Sum of after 2 replacing even numbers by X = 190 - (88 + 92) + X = 190 - 180 + X Now Sum of 4 even numbers = (38 - 4) x 4 = 136 According the question, we get 190 – 180 + X = 136 X = 136 – 190 + 180 X = 126
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