How many gallons of 12 salt solution should a biologist add to 5 gallons of 15% salt solution to get a 14% solution.

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

The jewelry store is having a sale. necklaces that were regularly priced at $23.50 are on sale for $18.80. what is the percentage of decrease in the price of necklaces?