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#### The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then :

Option 1: x = y + z

Option 2: 2x = y + z

Option 3: 3x = 2y - 2z

Option 4: none of these

Option 5:

#### 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 ?

Option 1: 16,12

Option 2: 10,16

Option 3: 23,9

Option 4: 8,7

Option 5:

#### 10 years ago, the average age of a family of 4 members was 24 years. Two children having been born (with age diference of 2 years), the present average age of the family is the same. The present age of the youngest child is :

Option 1: 1

Option 2: 2

Option 3: 3

Option 4: 4

Option 5:

#### The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is :

Option 1: 35

Option 2: 36.5

Option 3: 40

Option 4: 42

Option 5:

#### The average age of a group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years join the group on the spot due to which their average age becomes 15.5 years. The number of persons initially going for picnic is :

Option 1: 15

Option 2: 20

Option 3: 23

Option 4: 24

Option 5:

#### The average age of 8 men is increased by years when two of them whose ages are 21 years and 23 years are replaced by two new men. The average age of the two new men is :

Option 1: 20

Option 2: 30

Option 3: 40

Option 4: 50

Option 5:

#### The average age of the boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is :

Option 1: 15

Option 2: 20

Option 3: 21

Option 4: data is inadequate

Option 5:

#### The average monthly salary of 20 employees in an organisation is Rs. 1500. If the managers salary is added, then the average salary increases by Rs. 100. What is the managers monthly salary ?

Option 1: 3600

Option 2: 3700

Option 3: 3800

Option 4: 3900

Option 5:

#### 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 ?

Option 1: 31( 5/7)

Option 2: 32( 5/7)

Option 3: 33( 5/7)

Option 4: 34( 5/7)

Option 5:

#### 16 children are to be divided into two groups A and B of 10 and 6 children. The average percent marks obtained by the children of group A is 75 and the average percent marks of all the 16 children is 76. What is the average percent marks of children of group B ?

Option 1: 233/3

Option 2: 243/4

Option 3: 254/5

Option 4: 345/7

Option 5:

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