exam Maths Puzzle Numerical Ability

i cant figure this one out
how many liters of water must be evaporated from 10L of 40% salt solution to produce a 50% solution


THANKs ALOT

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exam Other Question

2x-5y+z=5
3x+3y-z=17
4x-3y+2z=17
Evaluate the following. Be sure to use the proper units.
5 lb/ft X 3 ft

I am really confused about this evaluating things