Arithmetical Operations

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1 If you write down all the numbers from 1 to 100, then how many times do you write 3 ?

A
11
B
18
C
20
D
21

2 Difference between two numbers is 5, six times of the smaller lacks by 6 from the four times of the greater. Find the numbers ?

A
12 & 7
B
13 & 8
C
15 & 10
D
14 & 9

3 In a chess tournament each of six players wil l play every other player exactly once. How many matches wil l be played during the tournament ?

A
12
B
15
C
30
D
36

4 Today is Varun's birthday. One year, from today he will be twice as old as he was 12 years ago. How old is Varun today ?

A
20 years
B
22 years
C
25 years
D
27 years

5 Reena is twice as old as Sunita. Three years ago, she was three times as old as Sunita. How old is Reena now ?

A
6 years
B
7 years
C
8 years
D
12 years

6 In a group of cows and hens, the number of legs are 14 more than twice the number of heads. The number of cows is

A
5
B
7
C
10
D
12

7 At the end of a business conference the ten people present all shake hands with each other once. How many handshakes will there be altogether ?

A
20
B
45
C
55
D
90

8 There are deer and peacocks in a zoo. By counting heads they are 80. The number of their legs is 200. How many peacocks are there ?

A
20
B
30
C
50
D
60

9 A man wears socks of two colours - Black and brown. He has altogether 20 black socks and 20 brown socks in a drawer. Supposing he has to take out the socks in the dark, how many must he take out to be sure that he has a matching pair ?

A
3
B
20
C
39
D
None of these

10 The number of boys in a class is three times the number of girls. Which one of the following numbers cannot represent the total number of children in the class ?

A
48
B
44
C
42
D
40