This is a basic question from ML aggarwal book of class 10th, chapter 7, ratio and proportion., ICSE board

In this specific ques we have ratio in the form of a:b and we have to find the duplicate ratio of them

Question no. 3, Chapter 7, ML Aggarwal

Solution:(i) 2: 3

We know that

Duplicate ratio of 2: 3 = 2

^{2}: 3^{2}= 4: 9(ii) √5: 7

We know that

Duplicate ratio of √5: 7 = √5

^{2}: 7^{2}= 5: 49(iii) 5a: 6b

We know that

Duplicate ratio of 5a: 6b = (5a)

^{2}: (6b)^{2}= 25a^{2}: 36b^{2}