Can u pls identify this will help me out thank u

So you are trying to find your missing angle which is represented by x

we know that when we see that red square in the corner of the triangle it is equal to 90°

then we are told the other angle measure is 49°

therefore we can subtract 49 from 90
90°-49°= 42°

x=42°

There is 240 red cars and there is 400 blue cars because 240/3=80 and 80*5=400