The marker costs 13 as much as the pen. The pen costs 13 as much as the book. The book costs 13 as much as the game. The price of the marker is what fraction of the price of the game?

you need to learn how to type fractions

m = 1/3 p
p = 1/3 b
b = 1/3 g
m = (1/3)^3 * g