A manager purchased a total of 21 coffee mugs and key chains each coffee mug cost $8.50 and each key chain cost $2.75 if the manager spent a total of a $132.50 write and solve the systems of equations

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.