Here is a number machine.
Input → ×2\times 2×2 → -7 → Output
What is the output when the input is 10?
What is the input when the output is 15?
Show that there is a value of the input for which the input and the output have the same value.
Practise OCR GCSE Maths Function Machines with exam-style questions for Foundation and Higher tier. 39 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.