book Maths Puzzle Numerical Ability

Hi,

I am wondering if there's a way to express the proportion of THREE quantities as a decimal, or if there is a formula to express the proportion of each of the quantities othe

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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 what two whole numbers when added together the sum is 123,when i subtract the lesser number from the greater number the difference is 45 ?