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lcm word problem MCQ Questions for Class 10

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2 questions tagged with lcm word problem.

Question 1/2 Hard Mathematics Real Numbers 4: HCF and LCM using prime factorisation Class 10 Level 10

ऐसी सबसे छोटी संख्या कौन सी है जो (36), (48) और (60) से पूरी तरह विभाजित हो और (1000) से बड़ी हो?

What is the smallest number greater than (1000) that is exactly divisible by (36), (48), and (60)?

Explanation opens after your attempt
Correct Answer

C. (1440)

Step 1

Concept

First find the LCM of (36), (48), and (60).

Step 2

Why this answer is correct

\(36=2^2\times 3^2\), \(48=2^4\times 3\), \(60=2^2\times 3\times 5\), so the LCM is \(2^4\times 3^2\times 5=720\). The smallest multiple greater than (1000) is (1440).

Step 3

Exam Tip

Find the LCM first, then choose its multiple according to the limit. चरण 1: पहले (36), (48), और (60) का लघुत्तम समापवर्त्य निकालें। चरण 2: \(36=2^2\times 3^2\), \(48=2^4\times 3\), \(60=2^2\times 3\times 5\), इसलिए लघुत्तम समापवर्त्य \(2^4\times 3^2\times 5=720\) है। (1000) से बड़ा सबसे छोटा गुणज (1440) है। चरण 3: पहले लघुत्तम समापवर्त्य, फिर सीमा के अनुसार उसका गुणज लें।

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Question 2/2 Hard Mathematics Real Numbers 4: HCF and LCM using prime factorisation Class 10 Level 10

तीन घंटियाँ क्रमशः (18), (24) और (30) मिनट के अंतराल पर बजती हैं। यदि वे साथ बजना शुरू करती हैं, तो फिर से साथ कितने मिनट बाद बजेंगी?

Three bells ring at intervals of (18), (24), and (30) minutes. If they start ringing together, after how many minutes will they ring together again?

Explanation opens after your attempt
Correct Answer

D. (360)

Step 1

Concept

The time when they ring together again is the LCM of (18), (24), and (30).

Step 2

Why this answer is correct

\(18=2\times 3^2\), \(24=2^3\times 3\), \(30=2\times 3\times 5\). The LCM is \(2^3\times 3^2\times 5=360\).

Step 3

Exam Tip

Use LCM for repeated-time meeting problems. चरण 1: साथ दोबारा बजने का समय (18), (24), और (30) का लघुत्तम समापवर्त्य होगा। चरण 2: \(18=2\times 3^2\), \(24=2^3\times 3\), \(30=2\times 3\times 5\)। लघुत्तम समापवर्त्य \(2^3\times 3^2\times 5=360\) है। चरण 3: दोहराव वाले समय प्रश्नों में लघुत्तम समापवर्त्य लगाएँ।

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