What value could be added to 2/15 to make the sum greater than 1/2

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Write the expression as a single natural logarithm. 2 in a - 4 in y