A earpenter had two big pieces of wood of equal length. The carpenter cut the first piece into smaller pieces of length 15 cm onch without remainder. The carpenter cut the second piece into smaller pieces of length 24 cm each without remainder. Determine the minimum length of each of the big pieces of wood.

Exercise 4.1 1 Work out the highest common factor (HCF) of \( \begin{array}{ll}\text { a } 8 \text { and } 12 & \text { b } 6 \text { and } 15 \\ \text { c } 7 \text { and } 35 & \text { d } 24 \text { and } 40\end{array} \) \( \begin{array}{l}2 \text { Which fraction is larger in each pair? }\end{array} \)

If I write the three measurements in descending order, which one will be in the middle? Select one: \( \begin{array}{l}54,9 \mathrm{~km} \\ 45,09 \mathrm{~km} \\ \text { - } 450,9 \mathrm{~km}\end{array} \)

4. Malt and Lionel left their houses at the same time and drove in they respective cars to the city which was 200 km away. When Matt reached the city. Lionel still had 50 km more to travel. Lionel finally completed the journey 36 minutes later. How long did Lionel take to drive to the city?

83 Найдите произведение: \( \begin{array}{l}\text { а) } \frac{4}{9} \cdot \frac{9}{7} \cdot \frac{7}{17} \cdot \frac{17}{28} ;\end{array} \)

A ladder has 50 rungs. The bottom rung is 1 m long. Each rung is \( 12,5 \mathrm{~mm} \) shorter than the rung beneath it. Determine the total length of wood required to make 50 rungs.