The pupils followed the teacher to visit a fruit farm last week. There were 4360 oranges and mangosteens in the farm. There were 456 more mangosteens than orang

let o = amount of oranges
     m = amount of mangosteens

then:
o + m = 4360
m = 456 + o (456 more mangosteens than oranges)

substitute m into the first eq.:
o + m = 4360
o + (456 + o) = 4360
2o = 3904
o = 1952

substitute o = 3904 back into the first eq.:
1952 + m = 4360
m = 2408

Therefore, there are 2408 mangosteens.