A number is doubled is doubled and then decreased by 12. the result is 12.what is the original number?

Question

A number is doubled is doubled and then decreased by 12. the result is 12.what is the original number?

Answer 1

Let n = the unknown number

 

A number:   n

is doubled:  2n

then decreased by 12:  2n-12

The result is 12:   2n-12=12

 

To solve, first add 12 to both sides:

 

2n-12+12 = 12+12

2n = 24

 

To find out what n is (n=), divide both sides by 2.