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Change the fractions to over 20.
1/10 = 2/20
2/10 = 4/20
2/30 = 6/20
Dolphin = 1/4 of 20
= 5/20
20/20 - 2/20 - 4/20 - 5/20 - 6/20 = 3/20
1/10 = 2/20
2/10 = 4/20
2/30 = 6/20
Dolphin = 1/4 of 20
= 5/20
20/20 - 2/20 - 4/20 - 5/20 - 6/20 = 3/20