Positive integer multiples of 23 which lie between 400 and 499 are:
23 x 18 = 414
23 x 19 = 437
23 x 20 = 460
23 x 21 = 483
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Yes 400 is a multiple of 4 as 100 x 4 = 400
7 can go into 23 with a remainder of 2, hence 23 is not a multiple of 7
For example: 20*20 = 400 and there are many more
Least Common Multiple (LCM) for 39 23 is 897.
400/23=17.4 gallons.