Pleas ! solve for d. 3/15 - d/5 = 5/6 + d/3

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

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