Help with these math problems?
*These are proportions problems..*
A map is drawn so that every 3.1 inches on the map corresponds to an actual distance of 100 miles. If the actual distance between the two cities is 400 miles, how far apart are they on the map?
A solution contains 72 milliliters of HCl and 104 milliliters of water. If another solution is to have the same concentration of HCl in water but is to contain 65 milliliters of water, how much HCl must it contain?
A basketball player makes 9 of 15 free throws in the first week of the season. If she shoots with the same accuracy for the next week, how many of the 10 free throws she attempts will she make?