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Nine friends had a tea party. All boys t...

Nine friends had a tea party. All boys took only coffee and all girls took only tea. The cost per cup of coffee in rupees is numerically 2 less than the number of girls and the cost per cup of tea in rupees is numerically 2 less than the number of boys. If the ratio of the total expenses of the boys and the girls is ` 5 : 6`, then what is the cost of each coffee? (In Rs.)

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