Brain Exercises For Seniors: Teasers, Riddles, Puzzles, Trivia Matching, And More To Keep Your Mind Young And Nimble. Large Print by Brain workout

Author:Brain workout [workout, Brain]
Language: eng
Format: azw3, epub
Publisher: Brain Workout
Published: 2020-06-16T16:00:00+00:00

Next, move all the numbers one space counterclockwise around the square, leaving the center number in position:

2 7 6

9 5 1

4 3 8

The resulting rows and columns add up to 15 in any direction. This procedure works for any series of nine consecutive integers, although the sum will be different for each series.

Cannonball Express

The trains are approaching each other at a relative speed of 60 mph. Therefore they will pass each other after 10 minutes. Since the fly is flying steadily at a speed of 60 mph, it will cover exactly ten miles during the ten minutes it takes the trains to meet.

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