Ken used 2/5 of his blue ice-cream sticks to make a toy boat, 3/8 of his red ice-cream sticks to make a toy car and 2/3 of his green ice-cream sticks to make a toy plane. He used the same number of ice-cream sticks to make each of the toy models. What fraction of all his ice-cream sticks did he use? Give your answer in its simplest form. Ken had 1793 ice-cream sticks left, how many ice-cream sticks did he have in all?