book Maths Puzzle Numerical Ability

I'm stumped by this.

A collection of Quarters, Nickels, dimes and pennies are on a acounter.
The avergae value of the coins on the counter is 20 cents. If a another Quarte

Read Solution (Total 0)

book Other Question

Factor completely.

x^2 - 13x + 36

I get (x - 9) (x-4) by looking at it - but to break it down I am not sure how to get to this answer.

Thanks 3. Candy and Tim share a paper route. It takes Candy 70 minutes to deliver all the papers, whereas Tim takes 80 minutes. How long does it take them when they work together?