Number System {(742)² ÷ 36} ÷ 2 = ? 422.5 420.5 423.5 421.5 422.5 420.5 423.5 421.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = (174 x 174/36) ÷ 2 = 841/2 = 420.5
Number System [(18.6 x 4.5) + (7.8 ÷ 0.24)] ÷ 3.2 = ? 25.3125 26.3125 46.3125 36.3125 25.3125 26.3125 46.3125 36.3125 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = 83.7 + 32.5/3.2 = 116.2/3.2 = 36.3125
Number System The average of 7 numbers is 15, that of the first three is 6 and that of the last three is 23. What is the fourth number? 18 15 13 7 18 15 13 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 4th No. = (Total of 7 Nos) - (Total of first three + total of last 3) = (15 x 7) - (6 x 3 + 23 x 3) = 105 - (18 + 69) =105 - 87 = 18
Number System In a two-digit number, if it is known that its unit's digit exceeds its ten's digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is: 42 46 26 24 42 46 26 24 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the ten's digit be x. Then, unit's digit = x + 2. Number = 10x + (x + 2) = 11x + 2 Sum of digits = x + (x + 2) = 2x + 2 (11x + 2)(2x + 2) = 144 2x2 + 26x - 140 = 0 (x - 2)(11x + 35) = 0 x = 2Hence, required number = 11x + 2 = 24.
Number System √(17)² + (17)² + (5)² - 2 = ? 19 16 17 18 19 16 17 18 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = √49 + 289 + 25 - 2 = √361 = 19
Number System A trader sells 40 metres of cloth for Rs 8,200 at a profit of Rs 25 per metre of cloth. How much profit will the trader earn on 40 metres of cloth ? Rs. 1,000 Rs. 600 Rs. 800 Rs. 1,200 Rs. 1,000 Rs. 600 Rs. 800 Rs. 1,200 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP S.P. per metre = 8200/40 = Rs. 205∴ C.P. per metre = Rs. (205 - 25) = Rs. 180∴ C.P. of 40 metre cloth= Rs. (40 x 180) = Rs. 7200∴ Gain = Rs. (8200 - 7200) = Rs. 1000
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