Question
There are a total of 20 Japanese, Vietnamese and Mongolian stalls at a food court. The number of Japanese stalls is twice the number of Mongolian stalls. The number of Mongolian stalls is thrice the number of Vietnamese stalls. How many less Vietnamese than Japanese stalls are there at the food court?
4 m

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There are a total of 20 Japanese, Vietnamese and Mongolian stalls at a food court. The number of Japanese stalls is twice the number of Mongolian stalls. The number of Mongolian stalls is thrice the number of Vietnamese stalls. How many less Vietnamese than Japanese stalls are there at the food court?