Question

twice a number decreased by 15 equals to 25 then the number is

Answer 1

let the number be = x

twice a number = 2x

the number decreased by 15 = 2x-15 


Twice a number decreased by 15 equals to 25 then the equation 

= 2x -15 = 25

2x = 25 + 15                              

2x = 40

x = 40/2  = 20

This is your answer ...............................:-)

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