Out of fifty students, twenty five are taking Math Competition classes and 29 are taking Geometry. Given that 12 are taking History and no math classes and nineteen students are in both math classes. How many are in at least one math class?

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.