The average temperature for Wednesday, Thursday and Friday was 40°C. The average for Thursday, Friday and Saturday was 41° C. If temperature on Saturday was 42° C, what was the temperature on Wednesday?
A. 39° C
B. 44° C
C. 38° C
D. 41° C
Answer: Option A
Solution(By Examveda Team)
Average temperature for Wednesday, Thursday and Friday = 40° CTotal temperature = 3 × 40 = 120° C
Average temperature for Thursday, Friday and Saturday = 41° C
Total temperature = 41 × 3 = 123° C
Temperature on Saturday = 42° C
Now,
(Thursday + Friday + Saturday) - (Wednesday + Thursday + Friday) = 123 - 120;
Saturday - Wednesday = 3
Wednesday = 42 - 3 = 39° C
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Comments ( 14 )
Related Questions on Average
A. 125 km/hr
B. 75 km/hr
C. 135 km/hr
D. 120 km/hr
Let a=Wednesday
b=Thursday, c=Friday, d=Saturday
Eqn 1: (a+b+c)/3 =40°C
Eqn 2: (b+c+d)/3 = 41°C
Where d=Saturday=42°C
(b+c+42)/3 = 41°C
b+c+42 = 41*3
b+c = 123-42 = 81°C
: Thursday+Friday=81°C
For Wednesday, using eqn 1
(a+81)/3 = 40°C
a+81 = 40*3
a = 120-81
a = 39°C
Temperature on Wednesday was 39°C
Right
Short cut method is also explain...
Good expalined
Saturday - Wednesday = 3 what we get
explain in shortcut method
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39 is correct answer
its correct ans is 39
ur solution is correct but answer choice not correct
it should be A)39`c
easy but some tricky