Answer:
Start by writing an equation with a a variable (call it X) to represent the number Dan started with.
He started with X, added 5 more, then his dog took half or divide by 2. He then ended up with 32. Solve:
(X +5)/2 = 32 Multiply each side by 2
X+5 = 64 Subtract 5 from both sides
X = 59