A uniform seesaw AB AB\,AB has length 4 m and is supported by a pivot at its centre. Child CCC, of mass 30 kg, sits at end AAA. Child DDD, of mass 45 kg, sits x x\,x m from the centre on the other side. The seesaw is horizontal and in equilibrium.
Find xxx.
42 exam-style questions on WJEC A Level Maths 4.10 Moments (A-level only), covering 4.10.1 Moments (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.