Question
A total of 18 red folders and green folders are in a container. The ratio of red folders to green folders was 1 : 2. Some black folders and purple folders were put into the container. For every 4 green folders that were already in the container, 3 purple ones were added. Then, the final number of red folders and black folders was 67 the final number of green folders and purple folders. Find the total number of black and purple folders.
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A total of 18 red folders and green folders are in a container. The ratio of red folders to green folders was 1 : 2. Some black folders and purple folders were put into the container. For every 4 green folders that were already in the container, 3 purple ones were added. Then, the final number of red folders and black folders was 67 the final number of green folders and purple folders. Find the total number of black and purple folders.