 <translate> 20 of 50 marbles are white so there are 50 - 20 = 30 red and blue marbles. The number of red marbles and blue marbles is the same, so there are 30 / 2 = 15 of each color. The difference between the number of white marbles and blue marbles is 20 - 15 = 5. Double the difference is 5 * 2 = 10 marbles. 10 marbles are removed to leave 50 - 10 = 40 marbles. So the answer is 40. <yor> 20 ninu 50 marbles jẹ funfun nitorina o wa 50 - 20 = 30 pupa ati bulu marbles. Nọ́ńbà àwọn bọ́ọ̀lù pupa àti bọ́ọ̀lù búlúù kò yàtọ̀ síra, nítorí náà, 30 / 2 = 15 ló wà nínú ọ̀kọ̀ọ̀kan wọn. Ìyàtọ̀ tó wà láàárín iye àwọn àpá funfun àti àpá búlúù jẹ́ 20 - 15 = 5. Ìyàtọ̀ náà tó ìlọ́po méjì, ìyẹn 5 * 2 = 10 marbles. A máa yọ àwọn ìlà mẹ́wàá kúrò láti fi àádọ́ta - mẹ́wàá = ogójì ìlà. Ìdáhùn náà ni 40. 