Help me with the step by step solution highly appreciated

In a school 2/3 of the students study a language of those who study a language 2/5 study french

With both problems. a.s.a.p directions on photo ^

At the county fair, the baxter family bought 6 hot dogs and 4 juice drinks for $12.90. the farley family bought 3 hot dogs and 4 juice drinks for $8.55. find the price of a hot dog and the price of a juice drink.