Luke started working on a 1000-piece jigsaw puzzle. The first day he worked on it, he put together 10% of the pieces. On the second day, he put together another 20% of the remaining pieces from the first day. On the third day, he put together 30% of the remaining pieces from the previous day. How many pieces does he have left to complete after the third day?
Luke started putting together, 1000 x 0.1 = <T>multiply(1000, 0.1)=100.0 pieces.
The next day, there were 1000-100 = <T>subtract(1000, 100)=900 pieces left.
Then he put together 900 * 0.2 = <T>multiply(900, 0.2)=180.0 pieces on the second day.
So there were 900 - 180 = <T>subtract(900, 180)=720 pieces left.
On the third day, he put together 720 * 0.3 = <T>multiply(720, 0.3)=216.0 pieces.
Therefore, Luke still has 720 - 216 = <T>subtract(720, 216)=504 pieces left to complete the puzzle.
