There is really no such thing as a "highest common multiple". Once you find the least common multiple of a set of numbers, you can keep adding the LCM to itself over and over again. Each new number you get will be a common multiple of your set of numbers, but each new number will always be larger than the previous. This means that you can keep adding while the number approaches infinity and you will still never find a highest multiple.
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Hcm of 50 and 60= 2
20 - 35 = -15If you take 35% off 20, you get 13.35 off of 20 is 20 - 35 = -15.
35% of 20 is 7 3/5 of 20 is 12
This question as written has no rational answer since the value of an hcm, being infinite, is unquantifiable. If you change the hcm to GCF, you could use 6 and 8 or 24 and 2.
It is 20/35 = 4/7.