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# 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

### Solution(By Examveda Team)

Average temperature for Wednesday, Thursday and Friday = 40° C
Total 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

1. 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

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5. Saturday - Wednesday = 3 what we get

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