Level 3
Peter made 75 paper aeroplanes in four days. Each day after the first day, he made double the number paper aeroplanes than the day before. How many paper aeroplanes did he make on the first day?
Level 2 PSLE
A plank of length 6.3 m was cut into three pieces. The first piece was thrice as long as the second piece. The second piece was 2 times as long as the third piece. How long was the second piece?