Puzzle 5

You have a balance scale and you need to weigh some vegetables, the weight of vegetables can be any integer from 1 to 100. How many minimum number of weights you will need to guarantee you can measure the vegetables weight correctly . For eg, if the weight of vegetables is 13 or 15 and you have weights of value 2,3,4,6, you can weigh it correctly.

Puzzle 4

Puzzle 3

Find the next line in the series . 
6
1 6
1 1 1 6
3 1 1 6
1 3 2 1 1 6

Puzzle 2

There’s a street on which all houses are numbered sequentially (1,2,etc) except that a house number cannot be a multiple of 10. Each house owner wants to buy a new number plate (with same numbers as before), so they go to a store to buy number plates. The store has 100 of each numbers (eg 100 0's, 100 1's, etc.), if the house owners are catered sequentially, which will be the first house number for which a number plate won’t be available?

Puzzle 1

Puzzle 1
There are 20 boxes, each box containing anywhere from 1 to 10 balls. No more than two boxes contain same no of balls. Each ball weighs 100gm. One of the boxes contains all defective ball/balls(each defective ball weigh 99 gm) You are given an electronic weighing machine. In how many minimum weighs can you determine which box has defective balls?