PUZZLES 2

Puzzle-1

Find the only 10 digit number using digits 0-9 each one exactly once such that:
first digit is divisible by 1, first two digit divisible by two, first 3 digits divisible by 3,..., first 10 digits are divisible by 10.

Solution

Puzzle-2
Find four weights using which you can measure all integer weights between 1 Kg and 40 Kg using a common balance.

Solution