Answer:
20%
Step-by-step explanation:
given the info, let's add up all of the marbles we have so far
7 + 4 + 2 + 3 = 16 marbles
the rest are white and the total number of marbles in the bag are 20
16 marbles + white marbles = 20 marbles
there must be 4 white marbles
putting this in a fraction is 4/20
to put in percentage multiply by 100
4/20 × 100 = 20%
