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You divide the number by 5.
-- To add one fifth to a number, add 0.2 to it. -- To find a new number that is one fifth bigger than the original number, multiply the original number by 1.2 .
21 and 105
3.2 x 4 = 12.8
To find out how many fifths are in 30kg, you first need to determine the value of one fifth of 30kg. One fifth of 30kg is calculated by dividing 30 by 5, which equals 6kg. Therefore, there are 6kg in one fifth of 30kg.