book Maths Puzzle Numerical Ability

how do i solve the problems??? i dont know how to do this can u help me???

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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? A team of pharmacists are considering how best to economise on their prescriptions budget, whilst still serving their customers’ needs as well as they can. They present you with th