book Maths Puzzle Numerical Ability

How many pounds of chocolates costing $4.60 per pound may be mixed with 6 lb of chocolates costing $5 per pound to produce a mixture that can be sold for $4.90 per pound?

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x+5/7=8/9 i have tried subtracting to get my answer. it is very comfusing. i have also tried adding. i don't know if what i get is write or wrong.(the / stands for a fraction) angle a is 4 times as large as angle b and angle c is 20 degrees less than angle b...what does each angle equal?