exam Maths Puzzle Numerical Ability

How many kg of water must be evaporated from 50kg of a 10% salt solution to obtain a 15% salt solution?

This was given to me out of a GEPA math tutorial book.

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exam Other Question
Find the vertex, line of symmetry, maximum or minimom value of f(x)=1/2(x+4)^2+4 Find each product
1.(3x)(4x^3)(-x^5)
2.5x^3(4x^5-2x)
3. (5x-2y)^2
4. (5x+1)(3x^2-3x-2)