It requires 4 minutes to cut a piece of wood into 2 sections. If the time required to cut into each section is the same, how many minutes are required to cut a piece of wood into 3 sections?
100 students went on a school trip by coaches. At least how many coaches are required to carry all of the students, given that each coach can carry no more than 23 students?
The figure on the right is composed of identical cubes with side length 5 cm. If they paint all top faces of the solid, what is the value of the painted area in cm2?