The average temperature of the first three days is 27� C and that of the next th

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Question
The average temperature of the first three days is 27� C and that of the next three is 29� C . If the average of the whole week is 28.5� C, the temperature of the last day of the week is?
Options
A. 10.5� C
B. 21� C
C. 31.5� C
D. 42� C

Correct Answer

31.5� C

Explanation

Temperature of last day = Sum of temperature of 7 days - sum of temperature of first 6 days.
= ( 7 x 28.5 ) - [( 3 x 27 ) + ( 3 x 29 )]
=31.5
? Temperature of last day = 31.5

Average problems

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1.
Out of four number, the average of first three is 15 and that of the last three is 16, if the last number is 19, the first is?
Options
A. 15
B. 16
C. 18
D. 19

2.
The average of 6 observation is 12. A new 7th observation is included and the new average is decrease by 1 , the seventh observation is?
Options
A. 1
B. 3
C. 5
D. 6

3.
The average salary of 20 workers in an office id Rs. 1900 per month . If the manger's salary is added , the average salary become Rs. 2000 p.m what is the manager's annual salary?
Options
A. Rs. 24000
B. Rs. 25200
C. Rs. 45600
D. None of these

4.
The average expenditure of a man for the first five month is Rs. 120 and for the next seven months it is Rs . 130. if he saves Rs 299 in that year, his monthly average income is?
Options
A. Rs. 140
B. Rs. 150
C. Rs. 160
D. Rs. 170

5.
The average age of 24 students in a class is 10. If the teacher's age is included, the average increase by one . The age of the teacher is?
Options
A. 25 year
B. 30 year
C. 35 year
D. 40 year

6.
A ship sails out to a mark at the rate of 15 kmph. and sails back at the rate of 10 kmph. The average rate of sailing is?
Options
A. 5 km/hr
B. 12 km/hr
C. 12.5 km/hr
D. 25 km/hr

7.
The average consumption of petrol for a car for seven months is 110 litres and for next five months it is 86 litres. The average monthly consumption is?
Options
A. 96 litres
B. 98 litres
C. 100 litres
D. 102 litres

8.
A batsman has a certain average runs for 11 innings . In the 12th innings he made a score of 90 runs and thereby decrease his average by 5 . His average after 12th innings is?
Options
A. 127
B. 145
C. 150
D. 217

9.
The average age of A, B , C, D five years ago was 45 years . by including P, the present average age of all the five is 49 years . the present age of P is?
Options
A. 64 years
B. 48 years
C. 45 years
D. 40 years

10.
Out of three number, the first is twice the second and is half of the third. If the average of the three number is 56, the three number on order are?
Options
A. 48, 96, 24
B. 48, 24, 96
C. 96, 24,48
D. 96, 48, 24

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