There are eight balls numbered with the numbers 40, 80, 100, 101, 190, 200, 260 and 292 in a bag.
Nam takes four balls out of the bag and calculates the sum of the numbers on these balls. It appears
that this sum is half of the sum of the numbers on the balls that remain in the bag. What is the greatest
number written on the ball taken out?
a. 101 b. 200 c. 260 d. 190 e. 292
