Answer: 9/20
Step-by-step explanation: 1/4+1/5=
your gonna find what both 4 and 5 multiply into so they both go into 20 so your gonna multiply them. your gonna take 1/4 times 5 top and bottom and then your gonna take 1/5 times 4 top and bottom then your gonna come out with 1*5/4*5+1*4/5*4= 5/20+4/20= 9/20