In the local boating pond there are 10 plain woode boats, each with a different number. The owner de that some of these boats will be painted: one in blue, one in green

Mario painted identification letters on his bicycles so that he could track which ones are being used and which are awaiting to be used by costumers. Each bicycle is marked with three letters of the English Alphabet. The first letter is M and the second letter is any letter before M written in descending order. No letters are repeated on any bicycle. How many bicyles in all does he have?

Jana has 10 blouses, 5 pairs of shoes, 5 skirts,and 5 hats. How many distinct 'outfits' does she have?

Find the number of different ways that an instructor can choose 7 students from a class of 12 students for a field trip.

Mr. Powers gave a coin to each of the 25 children who came to his door for a treat last Halloween. If the coins were nickles and dimes and he gave away a total of $1.45, how many received dimes and how many nickels?

One Sunday, 681 people visited the zoo. Of these, 291 were men, 135 were women, and the rest were children. How many more adults than children visited the zoo that day?

Find the number of playing cards in a standard deck of 52 cards that are either tens or red cards with numbers on them.

Find the number of different ways that an instructor can choose 5 students from a class of 13 students for a field trip.

A class of 15 students will chose between style of course text book; one text for each student. The choices are hardback, loose leaf and electronic copy. How many types of book orders are there? Note: a book order would be, say, 8 hardback, 4 loose leaf, 3 electronic and another might be 7 electronic, 3 hard back and 5 loose leaf.

There are 100 students who are taking history or sociology. If 10 are taking both courses and 45 are taking just history, how many are taking sociology?