Number System If (74)² is added to the square of a number the answer so obtained is 7780. What is the number ? 50 49 48 47 50 49 48 47 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.or, x² + (74)² = 7780or, x² = 7780 - 5476 = 2304∴ x = 48
Number System A number is doubled and 9 is added. If the resultant is trebled, it becomes 75. What is that number? 3.5 8 6 None of these 3.5 8 6 None of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,3(2x + 9) = 752x = 16 => x = 8
Number System If (72)² is subtracted from the square of a number, the answer thus obtained is 4617. What is the number ? 99 95 103 92 99 95 103 92 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x² - (72)² = 467Therefore, x² = 4617 + 5184Therefore, x² = 9801 Therefore, x = 99
Number System (4 86%of 6500) ÷ 36 =? 777.5 877.5 677.5 977.5 777.5 877.5 677.5 977.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 877.5
Number System The square root of 3 + “5 is : “(5/2) + “(1/2) “3 /2 + 1/”2 “5 /2 - 1/”2 “3 /2 - 1/”2 “(5/2) + “(1/2) “3 /2 + 1/”2 “5 /2 - 1/”2 “3 /2 - 1/”2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP “(5/2) + “(1/2)
Number System The difference between 45% of a number and 18% of the same number is 145.8. What is 30% of that number ? 188 162 245 141 188 162 245 141 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.45% of x - 18% of x = 145.8∴ x/100 (45 - 18) = 145.8∴ x = 145.8 x 100/27 = 540∴ 30% of 540 = 540 x 30/100 = 162
EXAMIANS