Answer:
14 marble
Explanation:
here's your solution
=> Total number of marble = 35
=> ratio of David and Jason = 2 : 3
=> let the ratio be in x
=> now, 2x + 3x = 35
=> 5x = 35
=> x = 35/5
=> x = 7
=> number of marble with David = 7*2 = 14
=> number of marble with Jason = 7*3 = 21
hope it helps