Brain Teasers

A team of 6 girls and 4 boys put together a 2200-piece jigsaw puzzle in 4 hours. The same jigsaw puzzle was put together in 8 hours by a team of two girls and five boys.

Who are better at putting jigsaw puzzles together, boys or girls, and by how much?

Insert +, -, x or / in suitable places on the left hand side of = so as to make the above equation true: