Number System How many numbers up to 100 and 300 are divisible by 11? 20 22 18 21 20 22 18 21 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (300 – 100)/11 = 200/11 = 18 2/1118 Numbers
Number System If x + y = 61 and xy = 888, What is the value of x²+ y² ? 1975 1955 1965 1945 1975 1955 1965 1945 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Because (x + y)² = x² + y² + 2xy∴ x² + y² = (x + y)² - 2xy∴ x² + y² = (61)² - 2 x 888= 3721 - 1776 = 1945
Number System 75% of 250 - ?% of 380 = 54.5 33 35 39 31 33 35 39 31 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 250 x 75/100 - 380 x ?/100 = 54.5= 250 x 75 - 380 x ?= 54.5 x 100= 18750 - 380 x ?= 5450= 380 x? = 18750 - 5450= 13300= ? = 13300/380 = 35
Number System If the difference between a number and its three fifths is 62, what is the number ? 145 175 155 165 145 175 155 165 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x - 3x/5 = 62or x = 62 x 5/2 = 155
Number System 56.21 +2.36+5.41 —21.4+1.5=? 54.08 34.08 44.08 64.08 54.08 34.08 44.08 64.08 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 44.08
Number System What least number should be added to 8602 to make it a perfect square ? 36 41 51 47 36 41 51 47 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP So, (93)² = 8649So, the required number to be added to make a perfect square = 8649 - 8602 = 47
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