Math Help

[Merellis]

Shikari, just make the doubled number must be more then 70 by the difference between the number and 140.

So make the number X to make it easier.

Find the value of X whose double exceeds 70 by as much as the value of X itself is less then 140.

2x - 70 = 140 - x
2x + x = 140 + 70
3x=210
x = 210/3
x = 70

2x - 70 = 140 - x
2(70) - 70 = 140 - 70
70 = 70

So x must equal 70, as doubled it is more then 70 by as much as 70 is less then 140.