The weight of a glass of jar is 40% of the weight of the jar filled with coffee beans. After some of the beans have been removed, the weight of the jar and the remaining beans is 60% of the original total weight. What fraction part of the beans remain in the jar?  Choose the correct choice from the following choices:
A) 1 / 5
B) 1 / 3
C) 2 / 5
D) 1 / 2
E) 2 / 3

Rationale: "let weight of jar filled with beans = 100 g weight of jar = 40 g weight of coffee beans = 60 g weight of jar and remaining beans = 60 g weight of remaining beans = 20 g fraction remaining = 20 / 60 = 1 / 3 answer is b ."
Answer: B