book Maths Puzzle Numerical Ability

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How many pounds of Brazillian coffee worth $5 per pound must be mixed with 20 pounds of colombian coffee worth $4 per pound, to produce a

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book Other Question
There is a slow leak in your bike tire. Its loding air at a rate of 2 pounds per square inch per day. Let x represent the amount of ari in the tire now. Write an expression for how many centimeter in one decimeter