Adam has some marbles. Bradley has three times as many marbles as Adam. Chris has 7 more marbles than Bradley. In total they have 91 marbles.
How many marbles does Chris have? Hence, find the total number of marbles Adam and Bradley have.
139 exam-style questions on AQA GCSE Maths Forming and Solving Equations. Each one has a worked solution and a mark scheme showing where the marks go.