Math in focus. grade 5 : the Singapore approach by Fong, Ho Kheong, 1948-Publication date 2009 Topics Mathematics -- Textbooks, Mathematics Publisher Singapore : Marshall Cavendish Education ; ...

Fifth grade students attend a math lesson with teacher Alex Ventresca, right, during class at Mount Vernon Community School, in Alexandria, Va., Wednesday, May 1, 2024.

It was a nice try, but incorrect. A few others came up with 42.5 dogs as the answer, with one woman explaining her method as follows: "49-36=13. 13/2=6.5. 36+6.5=42.5.