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Maths Puzzle
Numerical Ability
How many gallons of 40% acid solution must be mixed with 30 gallons of 16% solution to obtain solution of 30% acid?
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book Other Question
Find f(x) where y=f(x). 8y(6x-7)-12x(4y+3)+265-5(3x-y+2)=0
a friend has trouble simplifing 20-(-38).Explain how to solve this problem