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Answer:
21. 2, 3, 5, 7, 11, 13,
22. 20 = 1 x 20, 2 x 10, or 4 x 5. Factors of 20: 1, 2, 4, 5, 10, 20. Prime factorization: 20 = 2 x 2 x 5, which can also be written 20 = 2² x 5.
23. Answer. The two prime numbers to get the sum 48 is 19 and 29 because they are not divisible by 2 and if you add them the sum will you get is 48.
24. I don't know
25. 8
26.Therefore, 1 is the only common factor of 81 and 16 which means that 81 and 16 are co-prime.
27. Answer. Greatest 4 digit no. is -----> 9999................ Its Prime Factors are ----------> 3×3×11×101............... Factorization is as follows -----> 9999= 3×3333,,,,, 3333= 3×1111,,,,, 1111= 11×101,,,,,,,,,, 101= 101×1......
28. 0 is not come in table of 8 and 15
29.Answer. Here, remainder is 63.
30. Answer. These nos. are 51 ( 48×1 + 3), 99 (48×2 + 3), 147 ( 48×3 +3)... and so on. The least of them which leaves no remainder when divided by 7 is 147.
31. Therefore, the max. capacity of a container, which can measure the petrol of either tanker in exact number of litres = HCF OF 850 and 680. So, The maximum capacity of the container is 170 litres.
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