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Solution to: Eureka!

The block of lead is smaller than the block of wood (because the density of lead is higher than that of wood). When the scales with the blocks are immersed in water, the upward force on the block of lead will therefore be less than the upward force on the block of wood.

Conclusion: the block of lead will go down and the block of wood will go up, so the scales will turn left.

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