Here is a number machine.
Input →\rightarrow→ [×4][\times 4][×4] →\rightarrow→ [+5][+ 5][+5] → \rightarrow\,→ Output
What is the output when the input is 8?
What is the input when the output is 29?
84 exam-style questions on OCR GCSE Maths Function Machines. Each one has a worked solution and a mark scheme showing where the marks go.