Answer:
91 more marbles
Step-by-step explanation:
Step 1: find how many jars you need to fill
to do this you will have to solve this equation: 11–7 3/4 = 3 1/4
Step 2: find how many marbles you need
to do this you will have to solve this equation: 3 1/4 X 28 = 91
this tells you there are 91 marbles in 3 1/4 of the jars thus you need 91 more marbles.
hope this helps you!!!