Amy spends 1/3 of her time working on math and 1/4 working on science. how much time does she spend on history?

0 because nobody like history

jk

assuming that she spends all of her time on those 3 subjects

all-math-science=history

all=1
1-1/3-1/4=history
make bottom number same
3*4=12, so bottom number has to be 12
1/3*4/4=4/12
1/4*3/3=3/12
1=12/12

12/12-4/12-3/12=history
(12-4-3)/12=history
(12-7)/12=history
5/12=history
spends 5/12 of her timem on history

Letter b sorry i’m i’m wrong xx