Number System Find the least value of 3x + 4y if x2y3 = 6. 6 10 3 7 6 10 3 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 10
Number System The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is: 4/5 5/4 3/5 3/10 4/5 5/4 3/5 3/10 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1/x - x = 9/20 20x2 + 9x - 20 = 0 20x2 + 25x - 16x - 20 = 0 5x(4x + 5) -4(4x + 5) = 0(4x + 5)(5x - 4) = 0x = 4/5
Number System (2560 x 1.4) +(7400 x 0.6) =? 6543 7234 9160 8024 6543 7234 9160 8024 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 8024
Number System The difference between 8% of a number and 3% of the same number is 39. What is 2.8% of that number ? 24.84 27.84 25.84 21.84 24.84 27.84 25.84 21.84 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
Number System If one-third of one fourth of a number is 15, then three-tenth of that number is: 35 54 45 25 35 54 45 25 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,1/3 of 1/4 of x = 15x = 15 * 12 = 180So, required number = (3/10 * 180) = 54.
Number System The difference between a two-digit number and the number obtained by interchange the two digits of the number is 27. If the sum of the two digits of the number is 13, what is their product ? 37 38 40 39 37 38 40 39 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10x + y.∴ 10x + y - (10y + x) = 27or 9x - 9y = 27∴ x - y = 3 .......(I)x + y = 13 .......(II)From eqn (I) and (II)x = 8 and y = 5.So the number = 85Therefore, product = 8 x 5 = 40
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