Answer:
of the group's video games is either at Jeromes house or Marios house.
Step-by-step explanation:
Given the statement: Jerome has 1/4 of the group's video games at his house.
Also,Mario has 2/5 of the group's video games at his house.
⇒ Jerome has group's video games at his house(J) = 
and
Mario has group's video games at his house(M) = 
To find the fraction of the group's video games is either at Jerome house or Mario house.
Between two they have =
=
of the group's video games.