book Maths Puzzle Numerical Ability

find the LCD for the given rational expressions, and convert each rational expression into an equilalent rational expression with the LCD as the denominator.


5/12a^6b, 3b/14a^

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book Other Question
I actually have four questions....

1) A 25 pound mixture of two kinds of coffee is worth $174. Brand A costs $9 per pound and brand B costs $6 a pound. How many pounds of each Write in simplified radical form by rationalizing the denominator.

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Ö</font>3 - 2
—————</u>—————
-5Ö</font>3 + 8</PRE>