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21/40 is less than 1 and so it can't be expressed as a mixed number
They are: 3*7 = 21 and 2*2*2*5 = 40
20/21 times 42 = 40
One.
No. 0.4 is a decimal.
21-50
The number is 1.
To calculate the number of neutrons in an atom of potassium-40, subtract the atomic number (which is 19 for potassium) from the mass number (which is 40 for potassium-40). So, 40 (mass number) - 19 (atomic number) = 21 neutrons in potassium-40.
Oh, let's paint a happy little picture with those dodging numbers from 1 to 40! Dodging numbers are those that can't be divided evenly by a certain number. So, from 1 to 40, the dodging numbers would be 1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 15, 17, 18, 19, 21, 22, 23, 25, 26, 27, 29, 30, 31, 33, 34, 35, 37, 38, and 39. Just remember, there are no mistakes, only happy little accidents in math!
21/40 is less than 1 and so it can't be expressed as a mixed number
They are: 3*7 = 21 and 2*2*2*5 = 40
the answer is 21. because you do 40-19
21
Dodging numbers may be missing numbers in a sequence. For example, the underscore in the following sequence represents such a number: 2, 4, _ , 8, 10.
40% of 52.5 40/100=0.4 0.4x52.5=21
By subtracting 19 (atomic number of Potassium) from 40. You should come out with 21, which is the number of neutrons in potassium-40
8.4