Solution to brain teaser #2

31/81.

The total number of possibilities is 324 (6*6*9). The number of completely wrong guesses is 200 (5*5*8). So the number of partially or fully correct guesses is 124 (324-200). The probability is 124 out of 324, which can be reduced to 31 out of 81.

Example of logic grid:

How does a logic grid work in helping me solve brain teasers?

Some brain teasers give you a lot of information. In those instances, you may want to lay your information out neatly in the form of a logic grid. As the name suggests, it is a grid system you fill out based on logic. There is enough information given to you to be able to find the solution. You answer will usually take the form of: --

For starters, here is a relatively easy one for you to have a go. You can compare your answer to the solution posted next week:

Brian teaser #3

Four friends decided to plant a new tree in their yard to celebrate Labor Day. The new trees would each be put in a different area of their yards. As it happened each friend bought a different kind of tree and planted the new tree on a different day of the week. From the clues below, determine the full names of each friend, what kind of tree each bought, where in the yard it was planted, and on what day of the week each tree was planted.

Brain teaser #3
Names: Rebbecca, Sally, Tracy, and Wanda

Last Name: Best, Dart, Frost, and Grand

Trees: ash tree, cherry tree, maple tree, and spruce tree

Location: garden, patio, back yard, and front yard

Days of the Week: Monday, Wednesday, Thursday, and Friday

1. Wanda, whose last name wasn't Frost, didn't plant her spruce tree by the patio.

2. Tracy planted her tree before Mrs. Dart but after the woman who planted the ash tree.

3. Mrs. Best, whose first name wasn't Sally, planted her tree in the front yard, but not on Friday.

4. Rebbecca didn't plant her tree on Monday.

5. Mrs. Grand planted her tree before the woman who planted her tree in the back yard. Rebbecca didn't plant the cherry tree.

6. The trees were planted, in chronological order, as follows: Mrs. Frost, in the garden, Wanda, the maple tree.