exam Maths Puzzle Numerical Ability

If chocolate is 8.49 per pound and caramel is 3.65 per pound, how many pounds of each would you need to end up with 2.5 lbs of cany at an average cost of $5.50 per pound?

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exam Other Question
how do you solve -2x=2y+5 2+4+6+...+34
------------- = ?
3+6+9+...+51
In this problem, instead of adding the numbers one by one is there any short method?
Thank you.