# CSAT : Number system 20 most important varieties

**Number System**

Q1. 1/5 of a number exceeds 1/7 of the same number by 10. The number is:

- a) 125 b) 150 c) 175 d) 200

Q2. Two numbers differ by 5. If their product is 336, the sum of the two numbers is:

- a) 21 b) 28 c) 37 d) 51

Q3. Sum of two numbers is 40 and their product is 375. What will be the sum of their reciprocals?

- a) 8/75 b) 1/40 c) 75/8 d) 75/4

Q4. Which of the following fractions is the smallest?

- a) 9/13 b) 17/26 c) 28/29 d) 33/52

Q5. A number when divided by 899 gives a remainder 63. If the same number is divided by 29. The remainder will be:

- a) 10 b) 5 c) 4 d) 2

Q6. The smallest number to be added to 1000, so that 45 divides the sum exactly is:

- a) 35 b) 80 c) 20 d) 10

Q7. A six digit number is formed by repeating a three digit number; for example, 256, 256 or 678, 678 etc. Any number of this form is always exactly divisible by:

- a) 7 only b) 11 only c) 13 only d) 1001

Q8. The sum of three consecutive odd natural numbers is 147, then, the middle number is:

- a) 47 b) 48 c) 49 d) 51

Q9. The sum of all natural numbers between 100 and 200, which are multiples of 3 is:

- a) 5000 b) 4950 c) 4980 d) 4900

Q10. How many digits in all are required to write numbers from 1 to 50?

- a) 100 b) 92 c) 91 d) 50

Q11. A number of friends decided to go on picnic and planned to spend Rs 108 on eatables. Three of them however did not turn up. As a consequence each one of the remaining had to contribute Rs 3 extra. The number of them who attended the picnic was:

- a) 15 b) 12 c) 9 d) 6

Q12. The divisor is 25 times the quotient and 5 times the remainder. If the quotient is 16, the dividend is:

- a) 6400 b) 6480 c) 400 d) 480

Q13. In a test, 1 mark is awarded for each correct answer and one mark is deducted for each wrong answer. If a boy answers all 20 items of the test and gets 8 marks, the number of questions answered correct by him was:

- a) 16 b) 14 c) 12 d) 8

Q14. Of the three numbers, the second is twice the first and it is also thrice the third. If the average of three numbers is 44, the difference of the first number and the third number is:

- a) 24 b) 18 c) 12 d) 6

Q15. A number when divided successively by 4 and 5 leaves remainders 1 and 4 respectively. When it is successively divided by 5 and 4 the respective remainders will be

- a) 4,1 b) 3,2 c) 2,3 d) 1,2

Q16: The digit in unit’s place of the product 81 * 82 *83 … … 89 is

- a) 0 b) 2 c) 6 d) 8

Q 17. The sum of first sixty numbers from one to sixty is divisible by

- a) 13 b) 59 c) 60 d) 61

Number System answer key

1c 2c 3a 4a 5b 6a 7d 8c 9b 10c 11c 12b 13b 14c 15c 16a 17d 18a 19 c 20 b

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[…] and Distance Partnership Number System Boat and Streams Age determination Pipes and Cistern Percentage Profit and Loss LCM and HCF […]

[…] CSAT : Number system 20 most important varieties […]

[…] CSAT : Number system 20 most important varieties […]

[…] CSAT : Number system 20 most important varieties […]

[…] CSAT : Number system 20 most important varieties […]

[…] CSAT : Number system 20 most important varieties […]

[…] CSAT : Number system 20 most important varieties […]

[…] and Distance Partnership Number System Boat and Streams Age determination Pipes and Cistern Percentage Profit and Loss LCM and HCF […]