Safari Park : Paperback : HarperCollins Publishers Inc : 9780064462457 : 0064462455 : 20 Apr 2016 : It's four tickets for the River Raft! Just two for the Elephant Twirl! Paul, his sister, and his three cousins each have 20 tickets to spend, and a little simple algebra will help them figure out what rides they can go on at the new amusement park. Full-color illustrations.
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