Mock Set 1 Paper 02 Calculator

\begin{aligned} &\text{Number of green marbles} = 35, \quad \text{Number of yellow marbles} = 49. \\ &\text{Ratio (green : yellow)} = 35:49. \\ &\text{Divide both numbers by their greatest common divisor (GCD) which is 7:} \\ &35 \div 7 = 5, \quad 49 \div 7 = 7. \\ &\therefore \text{ Simplest form is } 5:7. \end{aligned}