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Two numbers are in the ratio 3 : 4 and their LCM is 120. The sum of the numbers is ______.

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Question

Two numbers are in the ratio 3 : 4 and their LCM is 120. The sum of the numbers is ______.

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Solution

Two numbers are in the ratio 3 : 4 and their LCM is 120. The sum of the numbers is 70.

Explanation:

Let the numbers be 3k and 4k (given ratio 3 : 4). 

Their LCM = lcm(3k, 4k) = 12k, so 12k = 120 ⇒ k = 10. 

Numbers are 30 and 40; sum = 30 + 40 = 70.

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Chapter 1: Real Numbers - FILL IN THE BLANK TYPE QUESTIONS (FBQs) [Page 1.44]

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R.D. Sharma Mathematics [English] Class 10
Chapter 1 Real Numbers
FILL IN THE BLANK TYPE QUESTIONS (FBQs) | Q 13. | Page 1.44
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