Some help please!!!!

[wander]

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I'm reviewing AAMC 7R and I'm puzzled by a solubility problem in the PS (#60), what does "(wt-wt)" means?
The question is asking for the solubility of substance in a 10% (wt-wt) aqueous solution.

 

[Jonathan13180]

10% wt-wt means that the substance is 10% of the weight of the combined solution/substance. For example, pick a 100g sample, so 10g would be 10% wt-wt, and 90g would be water.