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Maths Puzzle
Numerical Ability
3x+4x-15=0
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please show me how to do this problem {2L+2w+h=72
{ L=3w
{ h=2w
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?