exam Maths Puzzle Numerical Ability

Candy costing $4.30/lb is mixed with candy costing $7.80/lb. in order to create a mixture costing $6.30/lb. If the mix weighed 21 lbs. How many pounds of each must have been combined?

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exam Other Question

What is the formula for converting fractions into decimals ?(i forgot because i was using a shortcut instead of the real formula) Tutors can you help me?* thank you very much
USE LONG DIVISION TO FIND THE QUOTIENT Q(x) AND the remainder R(x) when P(x) is divided by d(x)

P(x)=x^4+2x^3-2x+4
d(x)=x-2