 
 <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. <ibo> 20 nke 50 marbles na-acha ọcha otú e nwere 50 - 20 = 30 red na-acha anụnụ anụnụ marbles. Ọnụ ọgụgụ marbles na-acha uhie uhie na marbles na-acha anụnụ anụnụ bụ otu, ya mere, e nwere 30 / 2 = 15 nke agba ọ bụla. Ihe dị iche n'agbata ọnụ ọgụgụ nke bọl na-acha ọcha na bọl na-acha anụnụ anụnụ bụ 20 - 15 = 5. Ugboro abụọ nke ihe dị iche bụ 5 * 2 = 10 marbles. A na-ewepụ 10 marbles iji hapụ 50 - 10 = 40 marbles. Ya mere azịza ya bụ 40. 