20
Q:

The average age of 15 students of a class is 15 years. Out of these, the average age of 5 students is 14 years and that of the other 9 students is 16 years, The age of the 15th student is :

A) 11 B) 12
C) 13 D) 14

Answer:   A) 11



Explanation:

Age of the 15th student = [15 * 15 - (14 * 5 + 16 * 9)] = (225-214) = 11 years.

Q:

The average of five consecutive odd numbers is m. If the next three odd numbers are also included, then what is the increase in the average?

 

A) 3 B) 0
C) 17 D) 8
 
Answer & Explanation Answer: A) 3

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7 378
Q:

The average of some numbers is 54.6. If 75% of the numbers are increased by 5.6 each, and the rest are decreased by 8.4 each, then what is the average of the numbers so obtained?

 

A) 55.6 B) 55.8
C) 56.7 D) 56.3
 
Answer & Explanation Answer: C) 56.7

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4 374
Q:

The average height of 5 boys is 175 cm. A sixth boy joined the group and the average height of all the boys in the group now increased by 1 cm. The height of the sixth boy is:

 

A) 180 cm B) 181 cm
C) 175 cm D) 179 cm
 
Answer & Explanation Answer: B) 181 cm

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2 318
Q:

The average of the marks of 30 boys is 88, and when the top two scores were excluded, the average marks reduced to 87.5. If the top two scores differ by 2, then the highest mark is:

 

 

A) 92 B) 96
C) 94 D) 90
 
Answer & Explanation Answer: B) 96

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8 488
Q:

24 students collected money for donation. The average contribution was Rs.50. Later on, their teacher also contributed some money.Now the average contribution is Rs.56. The teacher’s contribution is:

A) ₹56 B) ₹200
C) ₹106 D) ₹194
 
Answer & Explanation Answer: B) ₹200

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0 2797
Q:

Average of 8 numbers is 40. The average of first three numbers is 46 and the average of next two numbers is 50. If the sixth number is 6 and 10 less than seventh and eighth number respectively, then what is the value of eighth number?

 

A) 28 B) 22
C) 30 D) 32
 
Answer & Explanation Answer: D) 32

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3 328
Q:

1800 chocolates were distributed among the students of a class. Each student got twice as many chocolates as the number of students in the class. Calculate the number of students in the class.

 

A) 30 B) 40
C) 60 D) 90
 
Answer & Explanation Answer: A) 30

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5 340
Q:

The average of 60 student’s results is 38. If the average of the first 22 students is 36, and that of the last 32 students is 32, then the average result of the remaining students is:

 

A) 81 B) 77
C) 65 D) 52
 
Answer & Explanation Answer: B) 77

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7 354