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Maths Puzzle
Numerical Ability
A solution of 60 ml is 50% acid. How many milliliters of water must be added to dilute it to a 30% acid solution?
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book Other Question
find f(x) -g(x) when f(x) is x-1 and g(x) is 2x squared.
A student thinks that the expression (a+b)2 and a2+b2 are equal to one another. How would you explain to the student why this is not so?