Number System If 70% of an equal to 40% of b, then ratio between a and b is? 7: 11 7: 4 None 4: 7 7: 11 7: 4 None 4: 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 70 a = 40 ba: b = 4: 7
Number System The sum of two numbers is 165 and the difference between them is 9. What is the average of these two numbers ? 85.5 84.5 82.5 83.5 85.5 84.5 82.5 83.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x + y = 165x - y = 92x = 174 ∴ x = 87 and y = 78∴ x + y/2 = 165/2 = 82.5
Number System The difference between 78% of a number and 59% of the same number is 323. What is 62% of that number ? Rs. 926 Rs. 986 Rs. 945 Rs. 1054 Rs. 926 Rs. 986 Rs. 945 Rs. 1054 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.78% of x - 59% of x = 323= 78x - 59x/100 = 323= 19x/100 = 323∴ x = 323 x 100/19 = 1700= 62% of 1700 = 1700 x 62/100 = 1054
Number System Complete the series : 1, 8, 27, 64, 125, 216 ..... 373 363 343 353 373 363 343 353 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 343
Number System What is the value of ? in the following equations ? 72/? = ?/50 100 40 60 80 100 40 60 80 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (?)² = 72 x 50= (6 x 6 x 2) x (5 x 5 x 2)= (6 x 5 x 2)² = (60)²∴ ? = 60
Number System The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is: 3/5 5/4 4/5 3/10 3/5 5/4 4/5 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
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