So the question ask to determine how long that the wooden artifact found in an ancient tombs and contains 70% of the carbon-14 was made, and base on the fact and the given data about the said artifact, the possible answer would be that the the artifact is 2948 years old. I hope you are satisfied with my answer
The number of boys that left the camp doesn't actually matter. since 12 girls left the camp, 8 are left and now you have to find 3/4 of 8 which is 6. since 4 boys left camp you add that to 6 which means your answer is 10 tell me if you have any questions