The average temperature of Monday, Tuesday and Wednesday was 37°C. While the average temperature of Tuesday, Wednesday and Thursday was 34°C. If temperature of Monday and Thursday was in the ratio 5 : 4, then find the temperature of Monday.

45°C

M + T + W = 37 × 3 = 111  (total)   ...........(i)

T + W + Th = 34 × 3 = 102 (total)   ...........(ii)  

(i) - (ii)

Mon - Th = 9°

*Monday : Thursday =5 : 4 (given)

∴ 5x - 4x = 9°

x = 9°

Temp. of Monday = 5x = 5 × 9^° = 45°