Whitney bought 9 books about whales and 7 books about fish. She also bought 3 magazines. Each book cost $11 and each magazine cost $1. How much did Whitney spend in all?
The total number of books is 9 books + 7 books = <T>add(9, 7)=16 books.
The cost of the books is $11/book × 16 books = $<T>multiply(11, 16)=176
The cost of the magazines is $1/magazine × 3 magazines = $<T>multiply(1, 3)=3
Whitney spent $3 + $176 = $<T>add(3, 176)=179 in all.
