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OpenStudy (anonymous):
find the least number which on decreasing by 20 is exactly divisible by 18,21,28,30
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OpenStudy (anonymous):
okay, so find the LCM of 18 21 28 and 30. 18 = 3*3*2 21 = 3*7 28= 2* 2 *7 30 = 2* 3 * 5 therefore LCM is 3*3*2*7*2*5 = 1260. When you decrease 1280 by 20, you get 1260, the LCM.
OpenStudy (anonymous):
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