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Q: How do you write an equation for five less than twice a number is between thirteen and twenty-one?

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I dont Know... All I have to say is that my favorite number is twentyone/21!

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Someone needed something to fit in between 12 and 14. The number thirteen came about when people realized that something had to come between twelve and fourteen. When they added 3 + 10 or 8 + 5, they needed a number to result. Hence: thirteen.

The number 1,234,567,890,123 has thirteen digits.

Twice the difference between a number and thirteen can be written as 2 (b - 13) Five more than twice the difference between a number and thirteen can be written as 2 (b - 13) + 5. The algebraic expression is 2 (b - 13) + 5.

22(13+31)/2

It is: (13+41)/2 = 27

To find the number between two other numbers be find their mean or average. To do this we add the numbers and divide by the number of numbers we have, 2 in this case.13+6= 1919/2= 9.59.5 (that's nine and a half) is midway between six and thirteen.

The number for thirteen and seven hundredths is 13.07

Thirteen = 13

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