Well, isn't that a happy little math problem! To find one fifth of 420, you simply divide 420 by 5. So, 420 divided by 5 equals 84. That's the magic number you're looking for, a peaceful little fraction of the whole.
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You can write a simple equation: x + (x+1) = 420, where x is the first number. Alternatively, you can make x the second number and write x + (x - 1) = 420. Using the first one, x + x + 1 = 420, so 2x + 1 = 420. 2x = 419 (subtract 1), so x = 209.5. You can check this answer: 209.5 + 210.5 = 420.
The LCM is 420.
420.
One fifth plus one fifth is two fifths (2/5).
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