Question 2. In a class, there are 4 teams: Red, Blue, Green, and Yellow.

Here are what students in the class say about these teams:

• There are 24 students in total.

• 12.5% of the students are in team Red.

• Three quarters of the students are not in team Blue.

• 2/3 of the students are not in team Green.

How many students are there in team Yellow?

There are 55 students in a class. 25% of the number of boys is equal to two thirds of the number of girls. How many girls are there in the class?

The figure below consists of 8 identical circles with the diameter of 5cm. The circles touch the sides of the rectangle (as shown in the picture) and pass through the center of at least one other circle. What is the perimeter of the rectangle?

Observe the figures below and answer the questions.

How many unit squares are there in figure 10?

There are 5 children in a room.

Chi is taller than Anh.

Bao is shorter than Dung.

Dung is shorter than Anh but taller than Giang.

Which child is the second tallest?

We know that 15 workers can build a road in 20 days working 8 hours a day. If there are 5 more workers and they all work 10 hours a day, in how many days will they finish building the road?

Find the missing part.

A small part is removed from a cuboid to form the solid below. Find the volume of the solid.

Harry charges $4 to babysit for the first hour. For each additional hour, he charges 50% more than he does for the previous hour. How much money in total will Harry earn for 4 hours of babysitting?

Three congruent squares overlap as shown. The areas of the three overlapping sections are 2cm2, 5cm2 and 8cm2 respectively. The total area of the non-overlapping parts of the squares is 117cm2. What is the perimeter of each square?