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Number Problems

Dear Reader, Below you will find important formulas of Number System. Following that you will find solved questions. These questions will help you in preparation for all bank exams including IBPS, SBI, RRB and other banks. Basic Formulas: Sum of...
Question 1 Sum of seven consecutive odd numbers is 133. Find the sum of the first and the third number in the series. a. 18 b. 38 c. 48 d. 28 e. 58 Answer : b. 38 Solution : Since difference between any two successive odd numbers is 2, we can...
Question 1 5,15,35,?,105 a. 65 b. 55 c. 45 d. 75 e. 85 Answer : a. 65 Solution : 5 + 10 = 15 15 + 20 = 35 35 + 30 = 65 65 + 40 = 105 First term is added with 10, second with 20 and so on. Hence the number in place of question mark is 65. Question...
Question 1 1896 x 1896 = ? a) 458176 b) 5948316 c)3594816 d)6138896 Answer : c)3594816 Solution: 1896 x 1896 = 18962 = (1900 - 4)2 = (1900)2 + (4)2 - 2x1900x4 (by using the formula (a-b)2 = a2 + b2 - 2ab) = 3610000 +16-15200 = 3594816...
Question 1 Find X in 11 2/3 + 9 3/4 - 11 2/5 = X a) 10 1/60 b) 9 3/4 c) 11 3/4 d) none of these Answer : a) 10 1/60 Solution : By the above note, we can re write the given eqn as X = 11 2/3 + 9 3/4 - 11 2/5 = 11 + 2/3 + 9 + 3/4 - 11 - 2/5...
Question 1 The sum of a number and twice of 93 is 382. What is the difference of twice the number and 392? a) 1 b) 0 c) 382 d) 186 Answer : b)0 Solution : Let the number be X. We have to find 2X - 392. Given that, X + 2(93) = 382. Then, X + 186 =...
Question 1 Subtracting 35% of a number from the number we get the result as 99 9/20 then the number is: a) 168 b) 159 c) 153 d) 172 Answer : c)153 Solution : Let X be the number. Then the 35% of the number is 35X/100. And the Subtraction of 35% of...
Question 1 If the sum of a number and its seven-ninth is 144 then what is the number? a) 79 b) 81 c) 121 d) 149 Answer : b) 81 Solution: Let X be the number. Then seven-ninth of X = 7X/9 sum of X + 7X/9 = 144 9X + 7X = 9 x 144 = 1296 16X =1296 X =...
Question 1 If 1000 times of a number X is (100-X) more than X. Then what will be X? a) 10 b) 1/10 c) 2/5 d) 3/20 Answer : b) 1/10 Solution : Given that, the number is X. Then, 1000X = X + (100-X) 1000X = 100 X = 100/1000 = 1/10. Hence the...
Question 1 In a two-digit number, sum of the digits is 5 and the digit in ten's place is 2/3 times of the unit's digit then the two-digit number is a) 14 b) 41 c) data inadequate d) none of these Answer : d) none of these Solution : Let 10X + Y be...
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