1.

The ratio of two numbers is 7 : 9 and their LCM is 945. What is their HCF?1. 142. 153. 104. 12

Answer» Correct Answer - Option 2 : 15

Given :

Ratio of two numbers 7 : 9 

Their LCM is 945 

Formula used :

Multiplication of two numbers = LCM × HCF 

Calculations :

Let the HCF be x 

The number will be 7x and 9x 

⇒ 7x × 9x = x × 945 

⇒ x = 15 

∴ The HCF will be 15 



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