The average temperature for Monday, Tuesday and Wednesday was 42°C. The average temp. for Tuesday, Wednesday and Thursday was 43°C. If the average temp. on Thursday is 44°C, then the temp on Monday was-

Explanation

Let, the temp. on Monday, Tuesday, Wednesday, Thursday are a, b, c and d respectively. According to question, ## Page 7 $$ \frac{a + b + c}{3} = 42^{\circ}C \Rightarrow a + b + c = 126^{\circ}C $$ $$ \frac{b + c + d}{3} = 43^{\circ}C \Rightarrow b + c + d = 129^{\circ}C $$ d = 44°C (According to question) b + c = (129° – 44°)C = 85°C a = (a + b + c) – (b + c) = 126° – 85° = 41° C