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Samantha spent a total of $420 for daily expenses during her vacation in Mexico. She noted that, if she spent $7 less per day, she could have stayed for another 5 days. The number of days she actually spent on her vacation is:

After their shopping trip, Mike spent 3/5 of his money. Eve spent 1/2 of hers and Sue spent $50 they then had the same amount of money left. If the total amount left was $54, what was the total amount Mike and Sue had at first?

To make low-fat cottage cheese, milk containing 4% butterfat is mixed with 12 gallons of milk containing 1% butterfat to obtain a mixture containing 2% butterfat. How many gallons of the fattier milk must be used?