On average, an okapi weighs 290 kilograms and a llama weighs 160 kilograms.
O=Okapi
L=llama
O+L=450
3L=O+190
Solving that setup equation gets us with
4L=640
Divided by 4 to get each llama weighing 160KG
160+O=450
450-160=290
Getting the okapi to weigh 290KG
Hope this helped! Have a great day!!