At 9 am, a bird bath contained 7/8 gallon of water. each hour, 1/16 gallon evaporated. what time was it when 1/4 gallon of water remained?

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.