In the given question we are asked to calculate the length of remaining sides of the traingles, if triangle ABC is similar to EDF such that AB=5cm,AC=7cm, DF=15cm and DE=12cm.

Understanding ICSE Mathematics Avichal Publication, Similarity, chapter 13(i), question no 5

Hence, lengths of the remaining sides of the triangles are EF = 16.8 cm and SC = 6.25 cm.