Math Help

[Namine]

"by as much as the number itself is less than 140."

Yes the number itself is not equal to 140.

Therefore, 140 and the number must have a difference between them. (thus wira's equation of 140 - y = x, where y is the difference.)

"the number whose double exceeds 70 by as much as..."

Doubling the number is greater than 70, and there's a difference there too. This difference is as much as the difference between 140 and the number, thus there's equaly involved somewhere. Thus why I wrote,

2n - 70 = 140 - n

(which is the same as wira's equation after substituting for y)

It didn't say the difference between the number and 140 can't be the number itself. Thus 70 is viable solution.