Label the bags from 1 to 5
Take 1 bead out of Bag 1, and label it 1.
Take 2 beads out of Bag 2 and label them both with a 2.
Take 3 beads out of Bag 3, and label each with a 3. do this the pattern with Bags 4 and 5. Put these 15 beads on the tray of the scale...

If all 15 weighed 10 kilograms, it would be 150 kg. But since some of the beads weighs only 9 kilograms, it would be less than 150 kg. Subtract the number on the scale from 150. if the scale is 148, it’s bag 2. If the scale is 145, it’s bag 5.

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.::BattleZ::.