Aptitude puzzle

Aptitude puzzle

1. Find the missing term ?

  8 3 4
  9 4 6
12 2 ?

Answer:
4

Explanation:
By row :
8 * 3 = 24
( 24 / 6 ) = 4
9 * 4 = 36
( 36 / 6 ) = 6
12 * 2 = 24
( 24 / 6 ) = 4
By column :
8 * 9 = 72
( 72 / 6 ) = 12
3 * 4 = 12
( 12 / 6 ) = 2
4 * 6 = 24
( 24 / 6 ) = 4

2. Find a number consisting of 9 digits in which each of the digits from 1 to 9 appears only once. This number should satisfy the following requirements:
* The number should be divisible by 9.
* If the most right digit is removed, the remaining number should be divisible by 8.
* If then again the most right digit is removed, the remaining number should be divisible by 7.
* Continue this process until the last remaining number of one digit which should be divisible by 1.

Answer:
381654729

Explanation:
The number is 381654729 because
381654729 / 9 = 42406081
38165472 / 8 = 4770684
3816547 / 7 = 545221
381654 / 6 = 63609
38165 / 5 = 7633
3816 / 4 = 954
381 / 3 = 127
38 / 2 = 19
3 / 1 = 3