Question

10 The average temperature of first three days of a week is
40°C and that of next three days is 42°C. If the weekly
average is 40.5°C, then what is the temperature on the
last day of the week.
(a) 36°C
(b) 39.5°C (c) 37.5°C
(d) 40.5°C​

Answer 1

Answer:

average of first three days = 40

average of next three days = 42

average of total week = 40.5

we know that,

average of week = (average of first three days)

+ (average of first three

days)+ x

--------------------------------------

3

=> 40.5 = 40+42 + x

---------------

3

=> 121.5 = 82 + x

=> x = 121.5 - 82

=> x = 39.5

=> temperature on last day of the week = 39.5