SajjadAhmad wrote:
During a five-day period, Monday through Friday, the average (arithmetic mean) high temperature was 86 degrees Fahrenheit. What was the high temperature on Friday?
(1) The average high temperature for Monday through Thursday was 87 degrees Fahrenheit.
(2) The high temperature on Friday reduced the average high temperature for the five-day period by 1 degree Fahrenheit.
given
sum of 5 day temp = 85*5 = 430
#1
sum of 4 day temp = 87 * 4 ; 348
so friday temp = 430-348 = 82
sufficient
#2
We know that average high temperature from Monday through Friday = 86 degrees Fahrenheit.
Monday through Thursday = 86 + 1 = 87 degrees Fahrenheit.
high temperature on Friday = (86 x 5) – (87 x 4) = 430 – 348 = 82 degrees Fahrenheit.
IMO D
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