Dimensions replace a visual estimate

A fictional text-described drawing shows a straight horizontal overall distance of 240 millimetres. Two consecutive segments on that same line are labelled 75 millimetres and 95 millimetres, with one remaining nonoverlapping segment unspecified. The note says the sketch is not to scale. A learner estimates the final segment from its apparent width, while another subtracts the supplied segment dimensions from the overall length. No proprietary drawing is reproduced and no part is manufactured in this written exercise. It asks the learner to identify the supported dimension, preserve the assumption that the segments partition the same complete line and avoid extending the calculation to unrelated radii or offsets.