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Ana completed of her homework assignment. Her assignment contains 30 math problems. How many problems does Ana still need to complete

Ana completed of her homework assignment Her assignment contains 30 math problems How many problems does Ana still need to complete class=

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100% Means that it is the total. So You need to find 40% of the total homework she did. So since 100% is the total which is 30 pages.
40% will be 60% LESS than the total that she did. 
1=100% So since 60% is smaller than 1 it will be .60 don't forget the decimal.
You will have to do some math but 
.60 * 30=?
You would do .40 times 30. I got 12 questions