book Maths Puzzle Numerical Ability

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

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This is my question please help me resolve it. Thank you

Mr chanung decided to go to cinema to see a movie with his family...He has two option he can either go to the CINEPLEX f 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^