Ubuntu wishes to strengthen 30mL of 2% salt solution to mix that is 6% salt. How much 12% salt solution should he add to accomplish this?

Abus ride for a senior citizen cost $1.25. a monthly pass costs $35. write and inequality that represents the number of times a senior citizen must ride the bus for the monthly pass to be a better deal.

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan 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?

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.