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Maths Puzzle
Numerical Ability
A chemist mixes a 10% acid solution with a 50% acid solution to form 400ml. of a 40% solution. How much of each solution should be used in the mixture.
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book Other Question
The difference between two numbers is -38. Two times the smaller number minus five times the larger number is -217. What are the two numbers?
How can I simplify this equation to easily find the solutions for x and y to this equation:
x*y = (x+y)*(x+y-1)/4
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