The difference between twice a number and eighty yield twenty

Question

i need help on how it looks like I a  equation pls help????????????????????????????????????

Answer 1

The equation that represents this sentence is the following:  2x - 80 = 20

First thing to point out is that when the sentence is phrased, using the words  "difference between", look for the number or phrase in the sentence that immediately follows the word "between".  This number goes before the minus sign, and the number 80 goes after the minus sign.  So 2x represents twice a number comes before the minus sign and the 80 comes after the minus sign.  The word yield means equal to, then the 20.

To solve this equation:  2x - 80 = 20        Add 80 to both sides

                                     +80    +80            

                                ------------------

                                 2x/2    =  100/2   Divide each side by 2

 

                                   x   =   50

                                   

Answer 2

Mariana,

 

Difference means subtraction. So we are going to do "twice a number" minus 80. "Yields" means equals. So, now we know we're going to have

 

 "twice a number"    -   80   =   20

 

For the "twice a number" part,   "twice" means multiply by 2.  Since we don't know what the "number" is, let's just call it x.  Therefore, our equation is

 

2x-80=20.  Now, to solve it,

 

2x=100 ---> x=50

 

 

Answer 3

Difference implies subtraction.

 

n = the number

2n = twice the number

2n - 80 is the difference between them

 

2n - 80 = 20                add 80 to both sides

2n = 100                     divide both sides by 2

n = 50

 

Check

 

2(50) - 80

100 - 80

20