MWizard2k04

I'm also not sure what I was saying... I had that question in my Mathematics Olympiad contest.

yes. x, y and z are integers.

oops... I made a mistake.

I meant:

Lucy was given a box containing 60 pens: 20 red, 20 blue, 15 white and 5 black.

At least how many pens must she take from the box in order to get 16 pens of one colour without looking into the box? Give out solutions.

Let the length of the rectangle be L and the width be W.

a) L = 2W - 3

b) L = 11,

11 = 2W - 3

11 + 3 = 2W

14 = 2W

7 = W

Maybe you do not know how to simplify alphabets...

a less than b = b - a

8 less than (2 times x) = (2 times x) - 8

                                    = (2x - 8)

2 * 2 √ 3 = 2 * 2 * √3

              = 4 * √3

              = √16 * √3

             = √48

Division with decimals is similar to division with fractions.

9 ÷ 1.8 = 9 ÷ 9/5

            = (9 ÷ 9) * 5

            = 5

a) Discounted price (spent) -> $17 - $5 = $12

b) Percentage saved -> $5 ÷ $17 * 100% ≈ 29.412 % (3 decimal places)

Level: 6th grade

By using Distributive Property of Multiplication and Addition,

x(a+b) = xa + xb