To find one-fifth of a number, you divide the number by 5. In this case, 420 divided by 5 equals 84. Therefore, one-fifth of 420 is 84.
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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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