Jenny watched 1/3 of a movie in the morning, and she watched some more at night. By the end of the day, she still had 1/4 of the movie left to watch. How much of the movie did Jenny watch at
night? in a fraction

1. make all fractions have the same denominator

1/3 becomes 4/12
1/4 becomes 3/12

4/12 + what she watched at night +3/12 = 1
1 being the whole movie

4/12+x+3/12=1
(add 4/12 and 3/12 together)
x+7/12=1
(subtract 7/12 on both sides)
x=5/12

Jenny watch 5/12 of the movie at night