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Number System

Number System
Of the three numbers, second is twice the first and is also thrice the third. If the average of the three numbers is 44, the largest number is

72
38
56
44

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

72

Number System
2/11 of 3/7 of 8/13 of 12012 = ?

241
321
576
449

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 2 x 3 x 8 x 12012/11 x 7 x 13 = 576

Number System
A number consists of 3 digit whose sum is 10. The middle digit is equal to the sum of the other two and the number will be increased by 99 if its digits are reversed. The number is:

253
145
370
352

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the middle digit be x. Then, 2x = 10 or x = 5.So, the number is either 253 or 352. Since the number increases on reversing the digits, so the hundred's digit is smaller than the unit's digit. Hence, required number = 253.

Number System
An urn contains 9 blue, 7 white and 4 black balls. If 2 balls are drawn at random, then what is the probability that only one ball is white ?

90/190
92/190
89/190
91/190

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Total possible outcomes = 20C2 = 20 x 19/1 x 2 = 190Total favourable outcomes = 7C1 x 13C1 = 7 x 13 = 91∴ Required probability = 91/190

Number System
If the difference between a number and its 2/5 is 240, find the number.

360
400
480
440

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the no. be x Therefore x - 2x/5 = 240,        Therefore, 3x/5 = 240Therefore, x = 240x5/3 = 400

Number System
One-eighth of a number is 76. What will be 54% of the number ?

328.32
318.32
321.32
332.32

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the no. be x Therefore, 1/8 of x = 76Therefore, x = 60854% of 608                      = 608 x 54/100                      = 328.32

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