Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 378 382 396 343 378 382 396 343 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
Number System How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers? 1082 1192 1200 1092 1082 1192 1200 1092 ANSWER DOWNLOAD EXAMIANS APP
Number System How many numbers up to 200 are divisible by 2 and 3 both? 35 27 33 29 35 27 33 29 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 200/6 = 33 2/6 => 33 Numbers
Number System What is the remainder when 263251 is divided by 9? 8 1 3 6 8 1 3 6 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP If the sum of the digits of a number is divisible by 9, the number will be divisible by 9.2 + 6 + 3 + 2 + 5 + 1 = 19The nearest multiple of 9 is 18.19 - 18 = 1.
Number System If A + B = 30 and AB = 94, What is the value of A² + B² ? 712 824 625 920 712 824 625 920 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 If 70% of an equal to 40% of b, then ratio between a and b is? 7: 11 None 7: 4 4: 7 7: 11 None 7: 4 4: 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 70 a = 40 ba: b = 4: 7
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