Wednesday, April 1, 2015

418: Which is larger?

Which is true?

Left side is larger than Right side
Right Side si larger than Left Side.
The two sides are equal.
Not enough information?



How can we deal with this WITHOUT a calculator?

Tuesday, March 31, 2015

Sunday, March 29, 2015

415: Parallels and Variables

Raw, pure math. Ummmmmm, tasty.

But can you make the question harder by rearranging the variables?

source:

Saturday, March 28, 2015

414: Special Right Triangles




Friday, March 27, 2015

413: Red and Blue Rubik


Suppose that a white Rubik's Cube is painted blue on top and bottom and painted red on the four lateral sides. The cube is then separated into its 27 smaller cubes. 

How many unit cubes have at least one red face and one blue face?

Thursday, March 26, 2015

412: House Numbers

The houses on River Road are numbered consecutively from 10 to 132. Each house number is made with brass digits.

#105 would take 3 digits, for example.


1. How many brass digits are needed to form all the house numbers?

2. The numbers can be purchased for 2.29 each or $20.95 per dozen (of the same digit). What is the cheapest combination of numbers that you can arrange?