29
Q:

# 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 ?

 A) 16,12 B) 10,16 C) 23,9 D) 8,7

Explanation:

Total pice of the two books = Rs. [(12 x 10) - (11.75 x 8)]

= Rs. (120 - 94) = Rs. 26.

let the price of one book be Rs. x

Then, the price of other book = Rs. (x + 60% of x) = Rs.(x+(3/5)x) = Rs. (8/5)x

So,  x+(8/5)x =26 <=> x =10

The prices of the two books are Rs. 10 and Rs. 16

Q:

In a class of 60 students, 40% are girls. The average weight of the boys is 62kg and that of the girls is 55kg. What is the average weight of the whole class?

 A) 59.2kg B) 58.6kg C) 58.8kg D) 59kg

Explanation:

0 55
Q:

In a class of 40 students, 60% are girls. The average of the girls’ marks is 72 and that of the boys is 54. What are the average marks of the whole class?

 A) 65 B) 64.8 C) 65.4 D) 65.2

Explanation:

0 81
Q:

The average of five consecutive even numbers is M.If the next five even numbers are also included, the average of ten numbers will be:

 A) M + 5 B) 11 C) 10 D) M + 10

Explanation:

1 146
Q:

The average of the first four numbers is three times the fifth number. If the average of all the five numbers is 85.8, then the fifth number is:

 A) 33 B) 34 C) 39 D) 29

Explanation:

1 231
Q:

The average of the first four numbers is three times the fifth number. If the average of all the five numbers is 85.8, then the fifth number is:

 A) 33 B) 34 C) 39 D) 29

Explanation:

Let the fifth number be x.
The average of the first four numbers = 3x
Sum of all the first four numbers = 3x = 12x
The average of all the five numbers = 85.8
Sum of all the five numbers = 85.8 5 = 429
Sum of all the first four numbers + 5th number = 429
12x + x = 429
x = 429/13 = 33
The 5th number is 33.

0 199
Q:

The average of twelve numbers is 45.5. The average of the first four numbers is 41.5 and that of the next five numbers is 48. The 10th number is 4 more than the 11th number and 9 more than the 12th  number. What is the average of the 10th and 12th numbers?

 A) 47 B) 47.8 C) 46 D) 46.6

Explanation:

3 379
Q:

On 24th May 2008 the maximum temperature of Delhi, Kolkata and Mumbai were recorded as 35 deg C, 33 deg C and 34 deg C respectively. What was the maximum temperature of Chennai so that the average maximum temperature of those cities would be 35 deg?

 A) 34 deg C B) 35 deg C C) 36 deg C D) 38 deg C

Explanation:

6 354
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