Here is a number machine.
Input→[×4]→[+7]→Output \text{Input} \rightarrow [\times 4] \rightarrow [+ 7] \rightarrow \text{Output} Input→[×4]→[+7]→OutputFind the output when the input is 6.
Find the input when the output is 15.
84 exam-style questions on AQA GCSE Maths Function Machines. Each one has a worked solution and a mark scheme showing where the marks go.