3. If a School Park was painted by 16 men in 12 days during Brigada Eskwela, how many men can finish the work in 8 days at the same rate? If the number of men decreased by 4 , how many days can the remaining men finish the job?

3 A rectangular block has a volume of \( 40 \mathrm{dm}^{3} \). The base area is \( 20 \mathrm{dm}^{2} \). How tall is the rectangle?

Calcola il valore dell'espressione. \( \left(\frac{1}{7}+\frac{2}{3}\right)-\left[\frac{1}{6}+\left(\frac{2}{3}-\frac{2}{4}\right)-\left(\frac{1}{6}+\frac{2}{4}\right)\right]+\frac{2}{7}-\frac{3}{2}+\left(\frac{1}{21}+\frac{3}{2}\right. \)

\( 14 \Theta 17 ( \bmod 6 ) \)

TEST Quale delle seguenti frazioni genera un numero periodico misto: \( \begin{array}{llll}\text { A }-\frac{147}{6} & \frac{66}{18} & \text { C }-\frac{30}{45} & \text { D }-\frac{44}{24}\end{array} \)

What is \(\frac { 4} { 20} \) simplified?