let's do puzzles: logic game #12

A grade-school teacher will assign students to a single row of consecutive worktables, numbered 1 through 5. Two of the students are morning-schedule students and five of the students are day-schedule students. Three of the students are boys, and four of the students are girls. The teacher will assign the children to tables in accordance with the following conditions:

1.     Each student must be assigned to exactly one table, and no more than two students are assigned to a table.

2.     Each morning student must share a table with a day student.

3.     A boy cannot sit at a table with another boy.

4.     Day students cannot be at three adjacent tables.

Solution:

bbbgggg

mmddddd

___ ___ ___ ___ ___

1     2    3    4   5

1. 2 students max per table. Either 0, 1, or 2.

2. m->m d

3. bbbgggg

4. mmddddd

5. never _d_  _d_  _d_

Therefore:

___ ___  X __ ___


Number #3 must be empty in order to follow rule #5

NOTE: You should train your sketch skills in order to be able to identify and not to miss such important inferences as number #3 that must be empty. Otherwise, the game is virtually impossible to solve.