SOLUTION: Imagine that a triangle is formed with 10 pennies, as hsown below. By changing only 3 pennies, reverse the triangle so that it now points in the oposite direction. ......1 ...

Question 171441: Imagine that a triangle is formed with 10 pennies, as hsown below. By changing only 3 pennies, reverse the triangle so that it now points in the oposite direction.
......1
....2 - 3
..4 - 5 - 6
7 - 8 - 9 - 10

Found 2 solutions by Mathtut, jim_thompson5910:
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
take the coins from position 7 and 10 and place them up on either side of 2 and 3........then take number 1 and place it below 8 and 9.......DONE
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given figure.

.......1
.....2 - 3
...4 - 5 - 6
7 - 8 - 9 - 10

Bring the 1 all the way down

.....2 - 3
...4 - 5 - 6
7 - 8 - 9 - 10
.......1

Place the 10 2 steps up (right above the 6)

.....2 - 3 - 10
...4 - 5 - 6
7 - 8 - 9
......1

Finally, place the 7 2 steps up (right above the 4)

7 - 2 - 3 - 10
..4 - 5 - 6
....8 - 9
......1

Now the triangle is pointing in the opposite direction.
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