Adam and Justin had a total of 764 marbles. They used some of their marbles to make a marble track each and keep the remaining marbles. Adam had 1/3 as many marbles remaining as Justin after making d their marble tracks. The number of marbles Justin used to make his marble track was 63 more more than what he had left. Justin used 3 times as many marbles is Justin to make his marble track. How many marbles did Adam have at first?
let the number of marbles Adam left be (a)
the number of marbles Justin left will be 3a
the number of marbles Justin used will be 3a+63 which is 3 times to what Adam used
adam used a+21 marbles
adding the used and remaining marbes we get
the number of marbles Adam used are a+21=106
total number of marbles Adam had at first=85+106=191 marbles