Answer:
130kg
Step-by-step explanation:
First you need to convert 250kg into grams by multiplying it by 1000 since there are 1000g in 1kg that will give you an answer of 250000g. Then subtract 120000g from 250000g and you get 130000g. Then divide that answer by 1000 to get kilograms again.
250*1000g = 250000g
250000g-120000g = 130000g
130000/1000g = 130kg
