# Find the Value of X, If: (2x + 1): (3x + 13) is the Sub-duplicate Ratio of 9: 25. - Mathematics

Find the value of x, if: (2x + 1): (3x + 13) is the sub-duplicate ratio of 9: 25.

#### Solution

(2x + 1): (3x + 13) is the sub-duplicate ration of 9 : 25

Sub-duplicate ratio of 9 : 20 = 3 : 5

(2x + 1)/(3x + 13) = 3/5

10x + 5 = 9x + 39

10x - 9x = 39 - 5

x = 34

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#### APPEARS IN

Selina Concise Maths Class 10 ICSE
Chapter 7 Ratio and Proportion (Including Properties and Uses)
Exercise 7 (D) | Q 5.2 | Page 102