1.

The average temperature of first three days in a week is 25°C and that of the next three days is 29°C. If the average temperature of the whole week is 28.5°C, what is the temperature of the last day of the week?1). 35.5°C2). 39.50°C3). 29°C4). 37.50°C

Answer»

Average of a QUANTITY = SUM of quantities/Total NUMBER of quantities

The average temperature of first THREE days in a week is 25°C

Sum of temperatures of first three days = 25° × 3 = 75°C

The average temperature of the next three days is 29°C

Sum of temperature of the next three days = 29° × 3 = 87°C

The average temperature of the whole week is 28.5°C

Sum of temperature of the whole week is = 28.5° × 7 =199.5°C

The temperature of the last day of the week

= Sum of temperatures of the whole week – Sum of temperatures of first three days – Sum of temperatures of the next three days

= 199.5°C – 75°C – 87°C

= 37.5°C


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