Question 170
Lucia has a total of 2018 yellow, blue and green balls. There are 4 times more green balls than blue balls. In one *exchange* Lucia offers 13 yellow balls to her friend Cristina and receives 5 blue balls and 7 green balls. After a certain number of such *exchanges*, Lucia has no yellow balls, but she has 1271 green balls.
Determine how many yellow balls did Lucia have in the beginning.
Determine how many yellow balls did Lucia have in the beginning.