exam Maths Puzzle Numerical Ability

-5x^2-3=0

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exam Other Question

2.1x+45.2=3.2-8.4x

1/3(2x-1)=7

1/6(3/4x-2)=-1/5
A biker mixes 11 pounds of raisens that cost $2.30 per pound with peanuts that cost $4.50 per pound to make a mixture that cost $3.29 per pound. How many pounds of peanuts did the biker use?