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Maths Puzzle
Numerical Ability
how many pounds of Brazilian coffee worth $5 per pound must be mixed with 20 pounds of colombian coffee worth $4 per pound, to produce a mixture worth $4.20 per pound?
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book Other Question
If possible, simplify the ratinoal expression.
y^2 - 7y / y^2 - 8y +7
What is the sum of the first 30 positive odd whole numbers? is there some kind of relationship between the two?