Numbers TYPES OF NUMBERS Integers : All numbers whose fractional part is 0 (zero) like -3, -2, 1, 0, 10, 100 are integers. Natural Numbers : Counting numbers like 1, 2, 3, 4, 5, 6 … Basically, all integers greater than 0 are natural numbers … More on Numbers Numbers Please wait while the activity loads. If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled. If loading fails, click here to try again Question 1Which is not the prime number?435773101Arithmetic Aptitude Numbers Discuss itQuestion 1-Explanation: A positive natural number is called prime number if nothing divides it except the number itself and 1. 57 is not a prime number as it is divisible by 3 and 19.Question 2How many terms are there in 3,9,27,81........531441? 25121314Arithmetic Aptitude 4 Numbers 50 Aptitude & Reasoning MCQs with Answers Discuss itQuestion 2-Explanation: 3, 9, 27, 81..............531441 form a G.P. with a = 3 and r = 9/3 = 3 Let the number of terms be n According to the formula, Nth term of the G.P is represented as Tn = a x rn-1 Then 3 x 3n-1 = 531441 ∴ 3n = 312 ∴ n = 12Question 3 If the average of four consecutive odd numbers is 16, find the smallest of these numbers? 5 7 13 11 Arithmetic Aptitude 4 Numbers 50 Aptitude & Reasoning MCQs with Answers Discuss itQuestion 3-Explanation: Let the numbers be x, x+2, x+4 and x+6 Then (x + x + 2 + x + 4 + x + 6)/4 = 16 ∴ 4x + 12 = 64 ∴ x = 13Question 4If the sum of two numbers is 13 and the sum of their square is 85. Find the numbers?6 & 75 & 8 4 & 93 & 10Arithmetic Aptitude 4 Numbers 50 Aptitude & Reasoning MCQs with Answers Discuss itQuestion 4-Explanation: Let the numbers be x and 13-x Then x2 + (13 – x)2 = 85 ∴ x2 + 169 + x2 – 26x = 85 ∴ 2 x2 – 26x + 84 = 0 ∴ x2 – 13x + 42 = 0 ∴ (x-6)(x-7)=0 Hence numbers are 6 & 7 Question 5 The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number? 4 5 6 None of these Arithmetic Aptitude 5 Numbers Discuss itQuestion 5-Explanation: Let the ten’s digit be x and the unit’s digit be yThen (10x + y) – (10y + x) = 36 9(x – y) = 36 x – y = 4 Hence Option (A) is correct. Question 6A two-digit number is such that the product of the digits is 12. When 9 is subtracted from the number, the digits are reversed. The number is:34624326Arithmetic Aptitude 5 Numbers 50 Aptitude & Reasoning MCQs with Answers Discuss itQuestion 6-Explanation: Let the tens digit of the number be a and ones digit be b. Given: ab = 12 ................(i) and, (10a + b) - (10b + a) = 9 10a + b - 10b - a = 9 9a - 9b = 9 9(a-b) = 9 (a-b) = 1 .................(ii) Factors of 12 = 1, 2, 3, 4, 6, 12. and from equation (ii), (a - b) = 1 So, a = 4 & b = 3. Required number = ab = 43. Question 7Find a positive number which when increased by 16 is equal to 80 times the reciprocal of the number20-4-104Arithmetic Aptitude 5 Numbers 50 Aptitude & Reasoning MCQs with Answers Discuss itQuestion 7-Explanation: Let the number be x. Then x + 16 = 80 * (1/x) x2 + 16x – 80 = 0 x2 + 20x – 4x – 80 =0 (x + 20) (x -4) Therefore x = 4 Question 8What is the sum of two consecutive odd numbers, the difference of whose squares is 56?30283432Arithmetic Aptitude 5 Numbers 50 Aptitude & Reasoning MCQs with Answers Discuss itQuestion 8-Explanation: Let the no. be x and (x +2). Then (x + 2)2 – x2 = 56 4x + 4 = 56 x + 1 = 14 x = 13 Sum of numbers = x + (x +2) = 28Question 9The product of two numbers is 108 and the sum of their squares is 225. The difference of the number is: 543None of theseArithmetic Aptitude 5 Numbers 50 Aptitude & Reasoning MCQs with Answers Discuss itQuestion 9-Explanation: Let the numbers be x and y. Then xy = 108 and x2 + y2 = 225 (x –y)2 = x2 + y2 – 2xy (x –y)2 = 225 – 216 (x –y)2 = 9 Therefore (x –y) = 3Question 10The average of 21 results is 20. Average of 1st 10 of them is 24 that of last 10 is 14. the result of 11'th is :42444640Arithmetic Aptitude 6 Numbers 50 Aptitude & Reasoning MCQs with Answers Discuss itQuestion 10-Explanation: 11\'th result = sum of 21 results – sum of 20 results = 21 x 20 – (24 x 10 + 14 x 10) = 420 – (240 + 140) = 420- 380 = 40 123 There are 28 questions to complete. You have completed questions question Your accuracy is Correct Wrong Partial-Credit You have not finished your quiz. If you leave this page, your progress will be lost. Correct Answer You Selected Not Attempted Final Score on Quiz Attempted Questions Correct Attempted Questions Wrong Questions Not Attempted Total Questions on Quiz Question Details Results Date Score Hint Time allowed minutes seconds Time used Answer Choice(s) Selected Question Text Need more practice! Keep trying! Not bad! Good work! Perfect! Last Updated : 28 Jun, 2021 Share your thoughts in the comments Add Your Comment Please Login to comment...