Question
In a bookstore, the number of files was 511 of the total number of files and staplers together. Tommy sold the files and staplers in sets of 1 file and 4 staplers. After selling all the staplers, he still had 77 files left. How many staplers were in the bookstore at first?
4 m

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In a bookstore, the number of files was 511 of the total number of files and staplers together. Tommy sold the files and staplers in sets of 1 file and 4 staplers. After selling all the staplers, he still had 77 files left. How many staplers were in the bookstore at first?