Adam has £500 beth has £130 adam gives some money to beth. he now has twice as much money as beth. what percentage of his money did he give away?

Adam = £500
Beth = £130.

Let the money Adam gives Beth be x.

So Adam would have 500 -x.
Beth would then have  130 + x.

Adam now has twice as much as Beth.

     500 - x = 2*(130 + x)
     500 - x = 2*130 + 2*x
     500 - x = 260 + 2x
     - x - 2x  = 260 - 500
        -3x  = - 240

           x = -240/-3
           x    = 80

So Adam gave £80 to Beth.

To find the %:         (80 / 500) * 100%.      Use your calculator.

                                = 16 %.

So Adam gave away 16% of his money to Beth.      

2(4x - 5) = 49
4x - 5 = 49/2
4x = 24.5 + 5
x = 29.5 / 4
x = 7.375