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Number System

Number System
The sum of the digits of a two digit number is 12. If the new number formed by reversing the digits is greater than the original number by 54, then what will be the original number?

49
59
39
69

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

39

Number System
16.23 x 12.9 + 17.32 = ?

236.687
None of these
246.687
226.687

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 16.23 x 12.9 + 17.32= 209.367 + 17.32= 226.687

Number System
The difference between a two-digit number and the number obtained by interchanging the two digits is 63. Which is the smaller of the two numbers?

92
29
70
Cannot be determined

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the ten's digit be x and units digit by y.Then,(10x + y) - (10y + x) = 639(x - y) = 63x - y = 7Thus, none of the numbers can be determined.

Number System
The product of two consecutive odd numbers is 4095 What is the greater number ?

74
69
61
65

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the two consecutive odd numbers be 2x - 1 and 2x + 1.(2x - 1) (2x - 1) = 4095= 4x² - 1 = 4095= 4x² = 4096= x² = 1024∴ x = 32∴ The numbers are 63 and 65.Greater number = 65

Number System
4.78% of 1255 + 3.24% of 440=0.5% of ?

13849
11849
12849
14849

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

0.5 x ?/100 = 4.78 x 1255/100 + 3.24 x 440/100= 59.989 + 14.256∴ ? = 74.245 x 100/0.5 = 14849

Number System
The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:

20
30
None of these
40

ANSWER DOWNLOAD EXAMIANS APP
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