Small cubes that are identical in shape, size and material are used to build the four letters V, T, M and O shown below. Which letter-shaped construction is the heaviest?
There are 13 passengers on a bus. At the first stop, 3 passengers get off and 6 get on. At the second stop, 5 passengers get off and 2 get on. How many passengers are on the bus then?
Minh has the five stacks of identical books shown. In one move, he transfers 1 or 2 books from one stack to another. What is the smallest number of moves needed to make all five stacks equally high?
An and Bình travel from S to F along the edges of the rectangle. An follows $S\to A_1\to A_2\to F$; Bình follows $S\to B_1\to B_2\to F$. An travels 10 m farther. By how many metres is $A_2F$ longer than $B_2F$?
Each small triangle has three different edge colors: blue, yellow and red. Each edge has only one color. What color is the dashed edge? Enter 0001 for blue, 0002 for yellow or 0003 for red. In the picture, Xanh means blue, Vàng means yellow and Đỏ means red.
Squirrel and Hedgehog split a log into two equal pieces. Hedgehog then splits his piece in half and gives one half to Rabbit. His remaining piece is 2 m long. How long was the original log? Enter the length in metres.