Well done!

The trick is to notice the word *identical*.
Students who fail to take note of it will find this impossible to solve.

Is your child brilliant at Math?

This is simpler than it looks.

The area of each triangle is $$\frac{15*20}{2} = 150$$.

The unshaded part is simply the difference between $$\frac{2*150-230}{2} = 35$$.

It's divided by two because the unshaded area is missing in **both** triangles.

Scroogey

nice one. haven't seen such problems in the past years. and I don't miss them. :))
and yeah, still smarter than a 12year old. Good to check this occasionally.