Number System Find the least value of 3x + 4y if x2y3 = 6. 3 6 7 10 3 6 7 10 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 10
Number System If 35% of a number is 899.5, what is 68% of that number ? 1847.6 2247.6 1547.6 1747.6 1847.6 2247.6 1547.6 1747.6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Suppose the number is x.Then 35% of x = 899.5∴ 68% of x = 68/35 x 899.5 = 1747.6
Number System What is the remainder when 263251 is divided by 9? 8 3 1 6 8 3 1 6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP If the sum of the digits of a number is divisible by 9, the number will be divisible by 9.2 + 6 + 3 + 2 + 5 + 1 = 19The nearest multiple of 9 is 18.19 - 18 = 1.
Number System What least number shall be added to 4700 to make it a perfect square ? 71 61 91 81 71 61 91 81 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (69)² = 4761 and (68)² = 4624Clerly 4624 < 4700 < 4761So 61 should be added to make 4700 a perfect square.
Number System The difference between 45% of a number and 18% of the same number is 145.8. What is 30% of that number ? 162 245 141 188 162 245 141 188 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
Number System The difference between 8% of a number and 3% of the same number is 39. What is 2.8% of that number ? 25.84 21.84 27.84 24.84 25.84 21.84 27.84 24.84 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x(8 - 3)% = 39x = 3900/5 = 780∴ 2.8% of 780= 780 x 2.8/100 = 21.84
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