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Number System

Number System
(2560 x 1.4) +(7400 x 0.6) =?

8024
6543
7234
9160

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

8024

Number System
5358 * 51 = ?

273348
273268
273258
273358

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

5358 * 51 = 5358 * (50 + 1) = 5358 * 50 + 5358 * 1= 267900 + 5358 = 273258

Number System
The product of two consecutive odd numbers is 6723. Find is the greater number.

80
83
77
85

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the first odd number be x.Then, the other odd number would be x + 2.∴ x(x+2) = 6723= x2 + 2x = 6723= x2 + 2x = 6723= x2 + 2x - 6723 = 0= x2 + 83 - 81 x - 6723 = 0= x(x+83) - 81 (x + 83) = 0= (x + 83) (x - 81) = 0= (x + 83) (x - 81) = 0= x - 81 = 0∴ x = 81Hence, greater number = x + 2 = 81 + 2 = 83

Number System
A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ?

31/58
37/52
32/51
34/55

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Probability of having no red ball is9C3 / 12C3 = 21/55Probability of having at least one red ball is 1 - 21/55 = 34/55

Number System
Ratio between two numbers is 3: 4 and their sum is 420. Find the smaller number?

140
180
240
160

ANSWER DOWNLOAD EXAMIANS APP

Number System
63.602 + 153.756 + 94.754 - 84.321 - 122.204 = ?

142.587
141.587
140.587
143.587

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 312.112 - 170.525 = 141.587

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