Number System (1024—263—233)÷(986—764— 156) =? 8 None of these 10 6 8 None of these 10 6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 8
Number System The difference between a two-digit number and the number obtained after interchanging its two digits is 36. The sum of the two digits of the number is 12. Find the lowest such possible number. 47 49 48 50 47 49 48 50 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the digits be x and yTherefore, x + y = 12 .............(1)(10y + x) - (10x + y) Therefore, y - x = 4............. (2)Solving (1) and (2), y = 8 Therefore, x = 4There are two possible numbers 48 and 84. So the lowest no. is 48.
Number System The sum of a number and its reciprocal is one-eighth of 34. What is the product of the number and its square root? None of these 8 27 32 None of these 8 27 32 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,x + 1/x = 34/8 8x2 - 34x + 8 = 0 4x2 - 17x + 4 = 0 (4x - 1)(x - 4) = 0 x = 4required number = 4 * √4 = 4 * 2 = 8.
Number System 20% of the total number of students in a school play football. How many students do not play football if the total number of students in the school is 7600 ? 5976 6000 5800 6080 5976 6000 5800 6080 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 20% of 7600 = 1520Therefore, students who do not play football = 7600 - 1520 = 6080
Number System If the difference between the squares of two consecutive numbers is 47, what is the smaller number ? 25 26 23 24 25 26 23 24 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be (x + 1) and x.Therefore, (x + 1)² - x² = 47x² + 2x + 1 - x² = 472x + 1 = 47Therefore, x = 46/2 = 23
Number System 728.038 x 54.978 - 72.016 x 85.250 = ? 43900 53900 33900 23900 43900 53900 33900 23900 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 728 x 55 - 72 x 85.25 = 40040 - 6138 = 339900
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