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Three bells toll at intervals of 9, 12, ...

Three bells toll at intervals of 9, 12, 15 minutes. If they start tolling together, after what time will they next toll together ?

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The correct Answer is:
180 minutes.
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CBSE COMPLEMENTARY MATERIAL-REAL NUMBERS-SHORT ANSWER TYPE QUESTION-II
  1. Prove that sqrt(3) is an irrational number.

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  2. State fundamental theorem of arithmetic and hence find the unique fact...

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  3. 4. Prove that sqrt(3)+sqrt(5) is irrational.

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  4. Prove that 5-3/7 sqrt(3) is an irrational number.

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  5. Prove that 1/(2-sqrt(5)) is an irrational number.

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  6. Find HCF and LCM of 56 and 112 by prime factorization method.

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  7. Explain why: 7xx11xx13xx15+15 is a composite number.

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  8. Explain why: 11xx13xx17+17 is a composite number.

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  9. Explain why: 1xx2xx3xx5xx7+3xx7 is a composite number.

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  10. In a morning walk, three persons step off together and their steps mea...

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  11. During a sale, colour pencils were being sold in packs of 24 each a...

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  12. Find the largest number that divides 32 and 99 having leaving remaind...

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  13. The HCF of 65 and 117 is expressible in the form 65m-117. Find the val...

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  14. Using Euclid's division algorithm, find the largest number that divide...

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  15. Show that the square of any odd integer is of the form 4m+1, for some ...

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  16. Find the HCF of 180, 252 and 324 by Euclid's Division algorithm.

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  17. Find the greatest number of six digits exactly divisible by 18, 24 and...

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  18. Three bells toll at intervals of 9, 12, 15 minutes. If they start toll...

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  19. Show that one and only one out of n ,n+2or ,n+4 is divisible by 3, whe...

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  20. Find HCF and LCM of 404 and 96 and verify that HCF xx LCM= product of ...

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