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Three numbers are in the ratio 1:2:3 and...

Three numbers are in the ratio 1:2:3 and their HCF is 6, the numbers are
(a) 4, 8, 12       
(b) 5, 10, 15  
(c) 6, 12, 18   
(d) 10, 20, 30

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RD SHARMA ENGLISH-PLAYING WITH NUMBERS-All Questions
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  2. The smallest number which when diminished by 3 is divisible by 11, 2...

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  3. Three numbers are in the ratio 1:2:3 and their HCF is 6, the numbers...

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  4. The ratio of two numbers is 3:4 and their HCF is 4. Their LCM is (a...

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  5. Which of the following numbers is prime? (a) 23         (b)  51     ...

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  6. Which of the following numbers are twin primes? (a) 3, 5          ...

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  7. What smallest digit be written in the blank space of the number .......

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  8. Which of the following numbers is divisible by 6? (a) 1258     (b)...

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  9. Which of the following numbers is divisible by 11? (a) 7138965      ...

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  10. Which of the following numbers is a perfect number? (a) 12       ...

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  15. Define a perfect number. Write two perfect numbers.

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  16. Make a list of seven consecutive numbers, none of which is prime.

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  18. Find the smallest 5-digit number which is exactly divisible by 20, ...

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