If \( A: B=4: 3 \) and \( B: C=5: 2 \), find \( A: B: C \). A) \( 1: 2: 3 \) C) \( 20: 2: 5 \)

c) \( \frac{5}{6}-\frac{7}{8}+\frac{11}{12} \)

e) \( 1 \frac{1}{3}+2 \frac{1}{4}-3 \frac{5}{12} \)

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

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.

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