Final answer:
The Vikings stole 200 kg of gold from Lindisfarne in 879 AD, which is 40% of the original 500 kg of gold present there.
Step-by-step explanation:
To calculate how much gold the Vikings stole from Lindisfarne in 879 AD, we need to determine 40% of the total gold present there before the raid.
If there was 500 kg of gold present at that time, we find 40% of 500 kg by multiplying 500 by 0.40.
Doing this calculation provides us with the answer.
500 kg x 0.40 = 200 kg
So, the Vikings would have taken away 200 kg of gold from Lindisfarne.