There are 8 pills and they are all the same size and colour.

One pill weigh slightly more and is poisonous.

You have a balanced scale and you can only use it twice.

How can you find the poisonous pill?

0 votes

There are 8 pills and they are all the same size and colour.

One pill weigh slightly more and is poisonous.

You have a balanced scale and you can only use it twice.

How can you find the poisonous pill?

0 votes

Separate 8 pills into 3 groups, 3+3+2 pills

1. First weight 3 x 3 pills, if they are equal then go to step 2.1, if one is heavier then got to step 2.2

2.1 Weight 2 pills- heavier one is poisonous

2.2 Weight 1 x 1 pills from heavier group of 3 pills, if one of 2 is heavier, then this is the poisonous one. If they are equal, then the remaining one from the group is poisonous

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