A girl wanted to play on the seesaw. However, she couldn’t find another child to play with her, so she tied some books to one end of the plank to balance her weight at the other.
She just balanced against 16 books, when these were fixed to the short end of the plank, but if she fixed them to the long end of the plank, she only needed 11 as balance.
Now, what was the girl’s weight, if a book weighs equal to a three-quarter book and three-quarters of a pound? (Assume all books are uniform and weigh the same)
[submitted answers to show 1-2 days)