Answer :
first, I change the contries to variables
Vietnam - v
Australia - a
brazil - b
new Zealand - n
v=4a
b=8a
a=5n
brazil is not needed
plug in 5n for a
v=4(5n)
v=20n
Vietnam would actually be larger if it takes 20 new zealands for 1 vietnam
Vietnam - v
Australia - a
brazil - b
new Zealand - n
v=4a
b=8a
a=5n
brazil is not needed
plug in 5n for a
v=4(5n)
v=20n
Vietnam would actually be larger if it takes 20 new zealands for 1 vietnam