Math practice question for ssc cgl

1. What is the arithmetic mean of first 20 odd natural numbers ?
(1) 19
 (2) 17
(3) 22
(4) 20
Ans. 4
2. Two positive whole numbers are such that  the sum of the first number and twice the second number is 8 and their difference is 2. The number are :
(1) 7, 5
(2) 6, 4
(3) 4, 2
(4) 3, 5
Ans. 3
3. Which one of the following numbers is not a squareof any natural numbers ?
(1) 17956
(2) 18225
(3) 63592
(4) 53361
Ans. 3
4. Numbers 2, 4, 6, 8, 10, ..........196, 198, 200 are multiplied together. The number of zeros at the end of the on the right will be equal to-
(1) 21
(2) 22
(3) 24
(4) 25
Ans. 2
5.  800 chocolates were distributed among the students of a class.
East student got twice as many chocolates as the number of students in the class. The number of the students in the class was :
(1) 25
(2) 30
(3) 35
(4) 20
Ans. 4
6. The numbers are 2, 4, 6, 8, ....., 98, 100 are multiplied together. The number of zeros at the end of the product must be :
(1) 13
(2) 12
(3) 11
(4) 10
Ans. 3
7. How many digits in all are required to write numbers from 1 to 50?
(1) 100
(2) 92
(3) 91
(4) 50
Ans. 3
8. If doubling a number and adding 20 t the result gives the same answer as multiplying the number by 8 and taking away 4 from the product, The numbe is :
(1) 2
(2) 3
(3) 4
(4) 6
Ans. 3
9. A number of friends decided to go on a picnic and planned to spend rs. 108 on eatables. Three of them however did not turn up. As a consequence each one of the reamaining had to contribute rs. 3 extra. The number of them  who attend the picnic was :
(1) 15
(2) 12
(3) 9
(4) 6
Ans. 3
10. The numbers 1, 3, 5, 7 ..... 99 and 128 are multiplied together. The number of zeros at the end of the product must be :
(1) 19
(2) 22
(3) 7
(4) Nill
Ans. 3