Hello!
Alright so Mandy has 3 animals total. Two of them weigh 200g and the last one weighs 250g.
We can solve this by adding all of the animals masses together.
Animal 1+ Animal 2+ Animal 3= total mass of the animals in grams
200+200+250= 650g
Don't forget to record the unit of measurement (g) in your answer, hope this helps!