Two is right, Mciatto, but I really think you can't rely on simple solutions for test day.

The key is there is a disguised algebraic formula in the stem .

How many different points on l are twice as far from Point T as from point P?

"When you see from" this implies subtract.
So the distance from T - [b]X - Unknown point on number line=

2( P - Y[/b[b])

But, the problem with this solution is not every point fits the solution and we will have to keep searching.

Some of us will be lucky to come up with A(0), P(15), B( 20), and C( 30) for a combo that works out!

Need Akami Brah or Stolyar

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Ride em cowboy