#### What do you prefer between sea and mountain?

We made a soundage about what people prefer between sea and mountain for holidays (look to the image to see the percentages): blue part prefer the sea; yellow part prefer the mountain; red part don't mind between them. Knowing that the people who prefers sea are 146, how much are the total of people?

# Boxplot & histogram

Training
9

#### Least common multiple, Greatest common divisor

To solve the main task (and a lot of similar problems), knowing the least common multiple and the greatest common divisor can be useful. So, fill in the blanks and complete the definitions.

# Fractions

Learning
6

#### Rewriting Decimal Numbers as Fractions

Consider the following decimal numbers: 0.776 0.0002 7.75 Rewrite each number as a fraction and mark the solutions that match your results.

# Fractions

Training
6

#### Combination of all

Calculate this expression and write the result as a fraction $$\biggl( \frac{3}{5} - 0,\bar{4} \biggr) \cdot \frac{9}{2}+\biggl(2,\bar{3}-0,5 \biggr) \cdot \frac{3}{2}$$

# Fractions

Reasoning
6

#### Parallel lines

Decide, if the graph of a linear function with the points A(2;8) and B(-2;5) is parallel to the graph of the linear function with the points C(8;6) and D(12;9)

# Unassigned

Reasoning
5

#### Stair steps

In a linear function $y=ax$ the slope is always constant and equal to $a$. This means that the ratio $a =\frac{y}{x}$ is constant. This ratio is also called gradient. Can you find the height of the stair steps when you know that $2$ steps have height $32 \ cm$.

# Linear functions

Training
8