Problems on Numbers, Numbers MCQ Questions
1-The sum of two numbers is 40 and their difference is 4. Then the ratio of the two numbers is
(A) 11:9
(B) 11:17
(C) 20:19
(D) 21:5
2-The approximate standard deviation of 10 natural numbers is
(A) 2.57
(B) 2.67
(C) 2.77
(D) 2.87
3-Sum of three consecutive integers is 45. Find the integers.
(A) 13, 14, 15
(B) 14, 15, 16
(C) 15, 16, 17
(D) 16, 17, 18
4-Simplify 5√3 + 18√3 – 2√3
(A) 11√3
(B) 12√3
(C) 18√3
(D) 21√3
5-The sum of a number and its reciprocal is 6(1/6). Find the numbers.
(A) 5, 1/4
(B) 6, -5
(C) 6, 1/6
(D) 5, -1/5
6-Which of the following is not a prime number?
(A) 240
(B) 335
(C) 391
(D) 575
7-Simplfy 2/3 of [5(1/6) – 4(3/8)]
(A) 1/3
(B) 19/36
(C) -5/17
(D) -7/9
8- The sum of the digits of a two digit number is 15 and the difference between the digits is 3. What is the two digit number?
(A) 68
(B) 78
(C) 85
(D) 96
9- The sum and product of two numbers are 12 and 35 respectively. What is the sum of their reciprocals?
(A) 11/35
(B) 12/35
(C) 13/35
(D) 14/35
10-The least perfect square number which is divisible by 3, 4, 5, 6 and 8 is
(A) 900
(B) 1200
(C) 2500
(D) 3600
ANSWERS:
1-(A), 2-(D), 3-(B), 4-(D), 5-(C), 6-(C), 7-(B), 8-(D), 9-(B), 10-(D)