book Maths Puzzle Numerical Ability

If possible, simplify the ratinoal expression.

y^2 - 7y / y^2 - 8y +7

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book Other Question

A town with a current population of 615,600, has a growth rate of 1.3%. Find the multipler for the rate of exponential growth. 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?