Marks dog buried 1/2 of his bones in Josh's backyard. He buried 1/3 of his bones in kaylees backyard. he still had 4 bones left to bury.
How many bones did Marks dog have in all.
He has 1 - 1/2 - 1/3 = 1/6 of the original number left, and that number is 4.
4 is 1/6 of what number?