exam Maths Puzzle Numerical Ability

Here's my question: Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%? I got $11,000, but I d

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6+y/14y+8y^2+y^3+12 Is sqrt x^2=x an identity (true for all values of x)?
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