Question : The average temperature for Monday, Tuesday, Wednesday and Thursday was $48^{\circ}$. The average temperature for Tuesday, Wednesday, Thursday and Friday was $52^{\circ}$. If the temperature on Monday was $42^{\circ}$, then the temperature on Friday was (in degrees):
Option 1: 58$^\circ$
Option 2: 56$^\circ$
Option 3: 52$^\circ$
Option 4: 50$^\circ$
Correct Answer: 58$^\circ$
Solution :
Monday + Tuesday + Wednesday + Thursday = 4 x 48 = 192
Tuesday + Wednesday + Thursday + Friday = 4 x 52 = 208
$\therefore$ Monday = 42
Tuesday + Wednesday + Thursday = 192 – 42 = 150
$\therefore$ Friday = 208 – 150 = 58
Hence, the correct answer is 58.
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