book Maths Puzzle Numerical Ability

How many kilos of hard candies that is worth PHP 210 per kilo must be mixed with 12 kilos of chewy candies that is worth PHP 240 per kilo to produce an assortment of goodies that is worth PHP 230 per kilo?

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book Other Question
e^lnx+lny=x+y. I believe this to be true but I am not sure. Am I right? If possible, simplify the ratinoal expression.

x + 3 / x^2 + 6x + 9