Put a small pentagon inside a larger pentagon...
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Make an X with 5 pennies. Put hte 6th pennies on top of the center penny.
You can't
Having the same number of students in each row, 80 students can be arranged in 80 rows of 1, 40 rows of 2, 20 rows of 4, 10 rows of 8, and 5 rows of 16.
2 quarters, 6 nickels and 20 pennies make a dollar. Also, 8 dimes and 20 pennies make a dollar. Also, 4 dimes, 9 nickels and 15 pennies make a dollar. Also, 18 nickels and 10 pennies make a dollar. Also, 3 quarter and 25 pennies make a dollar.
This is only possible if you allow adding coinsNumber of coins in row x Number of rows = total number of coins5 x 2 = 10 coins4 x 4 = 20 coinsYou would need 10 more coins