Number System If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their square is: 180 28 160 12 180 28 160 12 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then, x + y = 20 and x - y = 8x2 - y2 = (x + y)(x - y) = 20 * 8 = 160.
Number System Sum of the digits number is 8 and their product is 12. Find the difference between the digits? 4 6 None 2 4 6 None 2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x + y = 8xy = 12(x – y)2 = (x + y)2 – 4xy (x – y)2 = 64 – 48 => (x – y) = 4
Number System 9 3/4 + 7 2/17 - 9 1/15 = ? 7 719/1020 7 817/1020 9 817/1020 9 719/1020 7 719/1020 7 817/1020 9 817/1020 9 719/1020 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Given sum = 9 + 3/4 + 7 + 2/17 - (9 + 1/15)= (9 + 7 - 9) + (3/4 + 2/17 - 1/15)= 7 + (765 + 120 - 68)/1020 = 7 817/1020
Number System Subtracting 30 from a number, the remainder is one fourth of the number. Find the number? 45 22 1/2 30 40 45 22 1/2 30 40 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3/4 x = 30 => x = 40
Number System Let R = qs—4. When s=8, R=16. When s=10, R is equal to 20 21 22 23 20 21 22 23 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 21
Number System The sum of the two digits of a two-digit number is 15 and the difference between the two digits of the two digit number is 3. What is the product of the two digits of the two digit number ? 14 54 None of these 36 14 54 None of these 36 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10 x + yWhere x > yAccording to the question,x + y = 15 and x - y = 3Solving both the equations,x = 9, y = 6∴ x x y = 9 x 6 = 54
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