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The average temperature of the first 4 days of a week was 37°C and that of the last 4 days of the week was 41°C. If the average temperature of the whole week was 39°C, the temperature of the fourth day was
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- 38°C
- 38.5°C
- 39°C
- 40°C
- 38°C
Correct Option: C
According to question ,
M + T + W + TH = 4 × 37 = 148°C ........ (i)
TH + F + S + S = 4 × 41 = 164°C ........ (ii)
M + T +....+ S + S = 7 × 39 = 273°C ........ (iii)
∴ The temperature of the fourth day = ( M + T + W + TH ) + ( TH + F + S + S ) - ( M + T +....+ S + S )
The temperature of the fourth day = 148 + 164 – 273 = 39°C
