A bag initially contains red marbles and blue marbles only, with more blue than red. Red marbles are added to the bag until only 1/4 of the marbles in the bag are blue. Then yellow marbles are added to the bag until only 1/7 of the marbles in the bag are blue. Finally, the number of yellow marbles in the bag is
doubled. What fraction of the marbles now in the bag are yellow?
(A) 1/5
(B) 1/4
(C) 1/3 (D) 3/5 (E) 1/2

the k side

step-by-step explanation:

plese mark mde brainliest!

alright so i think for this one it would to draw it out. this may be hard for me to try and draw, but i will do my best on here:

        r

  /       |     \

notice how it forms 2 triangles inside one bigger triangle.

so if we know the angle spr is the same as psr that is saying the measure of angle p is the same as angle s. this means the big triangle psr is either isosceles or equilateral. in both cases, the triangle is perfectly symmetrical when split down the middle, which is in this case rq. because we know it is perfectly symmetrical on both sides, we know that the two triangles inside the bigger one are equal.