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

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book Other Question

I am wondering if you would know how to solve the problem 2 ln x = 1
write a system of two equations in tow unknowns for each problem.

At Gween's garage sale, all books were one price, and all magazines were another price. Harriet bought four boo