The average temperature of Monday, Tuesday and Wednesday was 30° C and that of Tuesday, Wednesday and Thursday was 33° C. If the temperature on Monday was 32° C, then the temperature on Thursday was :

Average = $$\frac{Sumof Elements}{NumberofElements}$$

it is given that average temperature of Monday, Tuesday and Wednesday was 30° C and that of Tuesday, Wednesday and Thursday was 33° C

Sum of temperatures on Monday, Tuesday, Wednesday = 30 x 3 = 90 .....(1)

Sum of temperatures on Thursday, Tuesday, Wednesday = 33 x 3= 99 ....(2)

it is given that temperature on Monday = 32 .......(3)

hence using equation 1 and 3

Tuesday + Wednesday = 90 - 32 = 58 ....(4)

using equation 2 and 4

Thursday = 99 - 58 = 41 Celsius