If 5 : 8 :: 15 : x , then 5 × x = 8 × 15 → 5x = 120 → x = 24 . 4. The Unitary Method The Unitary Method is a technique to solve problems by first finding the value of one single unit , then multiplying to find the value of the required number of units.
Practice all solved examples and the "Exercise 10A, 10B, 10C" thoroughly. The word problems in the back exercise are the most valuable part of the chapter. If your specific RS Aggarwal edition has a different title for Chapter 10 (for example, some editions cover "Speed, Distance and Time" or "Basic Geometrical Ideas" in Chapter 10), please reply with the exact first page heading, and I will rewrite the essay for that topic immediately.
I understand you're asking for an essay on of RS Aggarwal . However, a "math essay" is different from a literary essay. In mathematics, an essay typically means a detailed explanatory note covering the concepts, formulas, solved examples, and applications of the chapter.