Solution:
we are given that Luis has 5/8 quart of grape juice.
He pours the same amount into each of 5 glasses.
we have been asked to find
Which equation represents the fraction of a quart of grape juice n that is in each glass?
Actually here 5/8 quart of grape juice gets divided in each glass equally so we will divide it by 5.
So we can write

Hence the equation representing the fraction of a quart of grape juice n that is in each glass is n=1/8.