In a semi-arid drainage basin, the annual volume of water extracted from the aquifer for agricultural irrigation is 13,500,000 m313,500,000\text{ m}^313,500,000 m3, while the annual volume extracted for domestic consumption in the regional municipality is 1,800,000 m31,800,000\text{ m}^31,800,000 m3.
Calculate the ratio of the volume of water extracted for agricultural irrigation to the volume of water extracted for domestic consumption. Give your answer in its simplest form.
87 exam-style questions on OCR A GCSE Geography Numerical and statistical skills. Each one has a worked solution and a mark scheme showing where the marks go.