Solution for #27

The big monkey rows a small monkey over; the big monkey comes back. The big monkey rows the other small monkey over; the big monkey comes back. Two humans row over; a human and a small monkey come back. (Now two humans, the big monkey, and a small monkey are on the starting side of the river, and the third human and the second small monkey are on the destination side.) human and the big monkey row over; the human and a small monkey come back. Two humans row over; the big monkey rows back. (Now all the monkeys are on the starting side of the river, and all the humans are on the destination side.) The big monkey rows a small monkey over; the big monkey comes back. Then the big monkey rows the other small monkey over.