#### Subtraction

Which fraction should we add to $\dfrac{3}{8}$ to find the result $\dfrac{5}{9}$?

# Fractions

Training
6

#### Getting to know Average

Calculate the average of the following 4 numbers: 9 / 10 / 2 / 3.

# Mean & median

Learning
4

#### Farmer Production

One farmer sold to four dealers the $\dfrac{2}{5}$, $\dfrac{2}{15}$, $\dfrac{1}{3}$ and $\dfrac{1}{10}$ of his production. How much of the production was not sold?

# Fractions

Training
6

#### Cyclists average weight

A group of 8 cyclist is composed by 2 women and 6 men. The average weight of the 8 cyclist is 80 kg. The average of men weight is 88 kg. Calculate how much is the average weight of women.

# Mean & median

Reasoning
8

#### Joseph rating problem

Joseph in the last 7 tests takes the following grades: 7.5 / 8 / 5.5 / 4 / 5.5 / 6 / 6.5. How much is his average rating? (round to the second decimal digit)

# Mean & median

Training
6

#### Faucets

A faucet fills up a tank in 10 minutes. Another faucet fills up the same tank in 15 minutes. How many minutes does it take for the tank to be full if we open the two faucets together?

# Fractions

Modeling
6