A rectangular field has a length of 105 metres, to the nearest 5 metres, and a width of k k\,k metres, to the nearest metre.
Work out the lower bound for the perimeter of the field in terms of kkk.
Work out the upper bound for the area of the field in terms of kkk.
193 exam-style questions on Eduqas GCSE Maths Bounds. Each one has a worked solution and a mark scheme showing where the marks go.