Number System Let R = qs—4. When s=8, R=16. When s=10, R is equal to 20 21 22 23 20 21 22 23 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 21
Number System If A + B = 30 and AB = 94, What is the value of A² + B² ? 824 920 712 625 824 920 712 625 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (A + B)² = (30)² = 900A² + B² + 2AB = 900Therefore, A² + B² = 900 - 2 x 94 = 900 - 188 = 712
Number System In a 150-litre mixture of milk and water, the percentage of milk is 84%. How much water should be added so that the percentage of milk becomes 52.5% ? 95 litre 90 litre 85 litre 80 litre 95 litre 90 litre 85 litre 80 litre ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In 150 litre, milk is 84%ie 150 x 84/100 = 126 litre Let us add x litres of waterTherefore, the quantity of mixture = 150 + x∴ 52.5% of (150 + x) = 126 litres 150 + x = 126x100/52.5 = 240 litres∴ x = 240 - 150 = 90 litres
Number System If 1.5 x= 0.04 y, then the value of (y-x) (y+x) is: 77/73 73/77 83/77 93/77 77/73 73/77 83/77 93/77 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 73/77
Number System Find the least value of 3x + 4y if x2y3 = 6. 6 7 3 10 6 7 3 10 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 10
Number System The sum of the two numbers is 12 and their product is 35. What is the sum of the reciprocals of these numbers? 7/32 12/35 35/8 1/35 7/32 12/35 35/8 1/35 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be a and b. Then,a + b = 12 and ab = 35.(a + b)/ab = 12/35= (1/b + 1/a) = 12/35Sum of reciprocals of given numbers = 12/35.
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