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Find the smallest 5-digit number which i...

Find the smallest 5-digit number which is exactly divisible by 20, 25, 30.

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RD SHARMA ENGLISH-PLAYING WITH NUMBERS-All Questions
  1. Make a list of seven consecutive numbers, none of which is prime.

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  2. The HCF of two numbers is 23 and their product is 55545. Find their...

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

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  4. Find the largest number which divides 615 and 963 leaving remainder...

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  5. The length, breadth and height of a room are 1050 cm, 750cm and 425...

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  6. Find the greatest number of four digits which is exactly divisible ...

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  7. Reduce (289)/(391) to the lowest terms

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  8. Three tankers contain 403 litres, 434 litres and 465 litres of dies...

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  9. A number which has only two factors is called a ...........

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  10. The smallest composite number is ............

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  11. Two perfect numbers are ............ and ............

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  12. The HCF of two consecutive odd numbers is ............

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  13. The prime triplet is ...

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  14. The greatest five digit number exactly divisible by 9 and 13 is (a)...

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  15. From the set {2, 3, 4, 5, 6, 7, 8, 9}, how many pairs of co-primes can...

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  16. If the number 2345a60b is exactly divisible by 3 and 5, then the max...

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  17. The HCF of 100 and 101 is (a)10100          (b)  1001        (c) ...

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  18. The greatest four digit number which when divided by 18 and 12 leave...

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  19. The GCD of two numbers is 17 and their LCM is 765. How many pairs of...

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  20. The number of factors of 1080 is (a) 32 (b) 28 (c) 24 (d) 36

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