Hector has 0.3 batting average(hits/ times at bat) if he gets a total of 10 more hits the next 10 times at bat, his batting average will jump to 0.4, determine how many hits he had originally

Carmen and matt are conducting different chemistry experiments in school. in both experiments, each student starts with an initial amount of water in a flask. they combine two chemicals which react to produce more water. carmen's experiment starts with 30 milliliters of water in a flask, and the water increases in volume by 8.5 milliliters per second. matt's experiment starts with 10 milliliters of water and increases in volume by 28% each second.