library assistant jobs

Wait — perhaps I misread the percentages.

Let me re-express with correct logic.

Ah — maybe the target is 50%? No, problem says 40%.

Wait — perhaps the current is not 45%, but lets double-check calculations.

So unless 40% is a mistake and its 50%, lets assume its 50% for coherence — but thats not faithful.

Wait — perhaps the new total is not 80 kg, but she makes a new 80 kg by adding. But same.

Another idea: maybe 80 kg is the final target weight, but she starts with 80 kg of soil at 45% sand — so 36 kg sand.

To lower to 50%? But problem says 40%.

Lets suppose the target is 35% — but problem says 40%.

Alternative: maybe the current is 30%?

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