20
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Lets see... Jill has 5 boards and cut each board into 4 pieces. 5x4=20 So she now has 20 pieces but she doesn't stop there. Jill uses 11 pieces for a project. 20-11=9 So she has 9 boards out of the original 20 boards remaining. 9/20 should be the correct answer.
Yes, they are equal.
0.4 is equal to 0.400
0.15 is equal to 3/20
equal to