Level 3
270 stickers are in 3 packets.
The 1st packet has 2 times as many stickers as the 2nd packet.
The 3rd packet is 3 times as many as the 1st packet.
How many more stickers are there in the 3rd packet and 2nd packet than in the 1st packet?
Level 2
At a stadium, there were 40 children from Club W and 10% more children from Club X. Some children from Club X left and the ratio of the number of children from Club W to the number of children from Club X became 5 : 2. How many children from Club X left?
Level 2
The height of the cuboid is 39 cm. The height of the cuboid is 30% more than its length but 20% more than its breadth. Find the volume of the cuboid.