Number System If a + b = 16 and ab = 68, what is the value of a² + b² ? 112 120 116 124 112 120 116 124 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP a + b = 16 Therefore, (a+b)² = (16)² = 256 a² + b² + 2ab = 256Therefore, a² + b² = 256 - 2 x 68Therefore, a² + b² = 256 - 136 = 120
Number System √9216 + √15376 = ? 231 224 227 220 231 224 227 220 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = √9216 + √15376= 96 + 124= 220
Number System If the sum of the two numbers is 22 and the sum of their squares is 404, then the product of the numbers is: 44 80 88 40 44 80 88 40 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the numbers be x and y. Then, (x + y) = 22 and x2 + y2 = 404 Now, 2xy = (x + y)2 - (x2 + y2) 2xy= 222 - 404 = 484 - 404 = 80xy = 40
Number System Complete the series : 1, 8, 27, 64, 125, 216 ..... 363 343 353 373 363 343 353 373 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 343
Number System 124, 235, 447, 760, 1174, ? 1489 1589 1389 1689 1489 1589 1389 1689 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP +111, +212, +313, +414
Number System 75% of 250 - ?% of 380 = 54.5 31 35 39 33 31 35 39 33 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 250 x 75/100 - 380 x ?/100 = 54.5= 250 x 75 - 380 x ?= 54.5 x 100= 18750 - 380 x ?= 5450= 380 x? = 18750 - 5450= 13300= ? = 13300/380 = 35
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