Number System I. 3x2-14x + 8 = 0 II. 2y2 - 1 7 y + 36 = 0 if x < y if x <= y if x > y if x >= y if x < y if x <= y if x > y if x >= y ANSWER EXPLANATION DOWNLOAD EXAMIANS APP l. 3x2 - 12x - 2x + 8 = 0or 3x(x - 4) -2 (x -4) = 0∴ x = 4, 2/3ll. 2y2 - 8y - 9y + 36 = 0or 2y (y - 4) -9 (y - 4) = 0or (2y - 9) (y - 4) = 0∴ y = 4, 9/2
Number System If (35)² is added to the square of a number the answer so obtained is 1394. What is the number ? 15 13 17 11 15 13 17 11 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x Therefore, x² + (35)² = 1394Therefore, x² = 1394 - (35)² = 1394 - 1225 = 169Therefore, x = √169 = 13
Number System Find the number, when 15 is subtracted from 7 times the number, the result is 10 more than twice of the number 15 4 5 7.5 15 4 5 7.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.7x -15 = 2x + 10 => 5x = 25 => x = 5
Number System How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers? 1082 1200 1092 1192 1082 1200 1092 1192 ANSWER DOWNLOAD EXAMIANS APP
Number System [(18.6 x 4.5) + (7.8 ÷ 0.24)] ÷ 3.2 = ? 46.3125 26.3125 36.3125 25.3125 46.3125 26.3125 36.3125 25.3125 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 83.7 + 32.5/3.2 = 116.2/3.2 = 36.3125
Number System If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their square is: 12 28 160 180 12 28 160 180 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.
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