a) 39° C
b) 44° C
c) 38° C
d) 41° C
Answer: a
Explanation: 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
(Thursday + Friday + Saturday) – (Wednesday + Thursday + Friday) = 123 – 120;
Saturday – Wednesday = 3
Wednesday = 42 – 3 = 39° C
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