12. Find the least number which on decreasing by 20 is exactly divisible by 18, 21, 28 and
30.
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12. Find the least number which on decreasing by 20 is exactly divisible by 18, 21, 28 and
30.
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Answer:
1260
Step-by-step explanation:
2 | 18,21,28,30
2 | 9,21,14,15
3 | 9,21 ,7,15
3 | 3,7 , 7 , 5
7 | 1, 7 ,7,5
5 | 1 ,1,1,5
1 | 1 , 1,1,1