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Aptitude > Math > Average

1 Amithab's average expenditure for the January to June is Rs. 4200 and he spends Rs.1200 in January and Rs.1500 in july.The average expenditure for the months of febraury to July is:
 
1Rs. 4250
2Rs. 4520
3 Rs. 4060
4None of these
 
Answer: Option1
2 The average price of 10 books is Rs. 12 while the average price of 8 of these books is Rs. 11.75. Of the remaining two books, if the price of one book is 60% more than the price of the other, what ia the pice of each of these two books ?
 
1 8,7
2 23,9
310,16
416,12
 
Answer: Option3
3 The average of 7 consecutive numbers is 20. The largest of these numbers is :
 
125
228
322
423
 
Answer: Option4
4 A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family ?
 
132 (6/7)
234(4/7)
335(4/9)
431( 5/7)
 
Answer: Option4
5 The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team ?
 
123 years
225 years
320 years
422 years
 
Answer: Option1
6 In an examination, a pupil's average marks were 63 per paper. If he had obtained 20 more marks for his Geography paper and 2 more marks for his History paper, his average per paper would have been 65. How many papers were there in the examination ?
 
18
211
39
414
 
Answer: Option2
7 A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What should be the number in place of x ?
 
18
213
311
47
 
Answer: Option4
8 Out of 9 persons, 8 persons spent Rs. 30 each for their meals. The ninth one spent Rs. 20 more than the average expenditure of all the nine. The total money spent by all of them was :
 
1Rs. 298.50
2Rs. 298
3Rs. 297.50
4Rs. 292.50
 
Answer: Option4
9 The average salary of all the workers in a workshop is Rs. 8000. The average salary of 7 technicians is Rs. 12000 and the average salary of the rest is Rs. 6000. The total number of workers in the workshop is :
 
124
221
328
426
 
Answer: Option2
10 The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years, The ratio of the number of boys to the number of girls in the class is :
 
14 : 5
22 : 3
31 : 2
4 3 : 4
 
Answer: Option2
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