Ten fifths make two wholes.
20
There are 21 thirds in 7 wholes.
There are 16 halves in eight wholes.
You can make 3 wholes
There are: 15/3 = 5 wholes
There are twelve thirds in four wholes.
There are 24 eighths in 3 wholes
27/4 = 6 wholes and a remainder of 3 quarters.
You can make 4 wholes from 8 halves.
4
There are ten tenths in a whole. Therefore: 10 X 2 = 20 (twenty tenths in two wholes).