Question

We had this math problem at our math competition today but we couldn’t solve it. Can you help us? The goal is the know the area of the red triangle with help of the area from the yellow.

Answer 1

Is it a parallelogram? If yes then, I believe there's a property that two triangles on the base of a ||gm are equal in area, and precisely half the area of the ||gm.

So by that property,

=>  143 + Middle + 6 = 136 + Middle + ?

=> 143 + 6 = 136 + ?

=> 149 - 136 = ?

=> ? = 13

ETA : 136* and 13*