Robert used 34 grams of iron filings in his second experiment. this is 16 grams more than twice the number of grams he used in his first experiment. how many grams of iton filings did he usein his experiment.

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.