book Maths Puzzle Numerical Ability

Kayla has 25 ounces of a 75% boric acid solution. How many ounces of 35% boric acid solution should she add to obtain a solution that is 60% boric acid? So far, I've come up with

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book Other Question
5/8x=3+1/2y solve for y let V1, V2, V3, and V4 be a basis of a four-dimensional vector space V.
i) Is it true that V1, V2, and V3 span a three-dimensional subspace of V? If so describe that space.
ii)