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
Options:
A . 38.5°C
B . 40°C
C . 39°C
D . 38°C
Answer: Option C Answer: (c)Using Rule 1, 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 = 148 + 164 – 273 = 39°C
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