If in a given number 5 8 9 4 3 2 7 6 1 4, we interchange the first and the second digits, the third and the fourth, the fifth and the sixth and so on, then counting from the right end, which digit will be sixth?

Number problems consists of number sequences, problems with algebraic expressions, mathematical calculations and other compatible problems.     Solved Examples: 1. How many such 7s are there in the following number sequence which are immediately followed by 4 but not immediately preceded by 8? 5 4 7 8 9 7 4 3 8 7 5 7 4 8 7 4 1 2 7 4 5 7 9 4 (a) Two (b) Three (c) Four (d) Five (e) None of these     Ans. (b)  Number of 7s which are immediately followed by 4 but not immediately preceded by 8 are :     5 4 7 8 9 7 4 3 8 7 5 7 4 8 7 4 1 2 7 4 5 7 9 4     1 2 3 2. A number is 9 times twice... Show more

Number problems consists of number sequences, problems with algebraic expressions, mathematical calculations and other compatible problems.    

Solved Examples:

1. How many such 7s are there in the following number sequence which are immediately followed by 4 but not immediately preceded by 8?
5 4 7 8 9 7 4 3 8 7 5 7 4 8 7 4 1 2 7 4 5 7 9 4 (a) Two (b) Three (c) Four (d) Five (e) None of these    
Ans. (b) 
Number of 7s which are immediately followed by 4 but not immediately preceded by 8 are :    
5 4 7 8 9 7 4 3 8 7 5 7 4 8 7 4 1 2 7 4 5 7 9 4    
1 2 3

2. A number is 9 times twice the other number. The sum of two numbers is 133. The two numbers are (a) 9, 124 (b) 11, 122 (c) 17, 166 (d) 7, 126 (e) 27, 136    
Ans.(d)
If the smaller number is x, then x + (2x × 9) = 133 x + 18x = 133    
19x = 133 x = 133 ÷ 19 = 7
If one number is 7, the other number is :    
133 – 7 = 126

3. If all the numbers from 1 to 28 which are exactly divisible by 3 are arranged in descending order, which would come at the sixth place from the top? (a) 12(b) 21(c) 15(d) 18 (e) 24    
Ans: (a)
The numbers divisible by 3 in descending order are : 27, 24, 21, 18, 15, 12, 9, 6, 3 and the number at the sixth place is 12.    

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