Jen has a jar of jam, and she ate 1/3 of the jam for lunch. If Jen ate 1/7 of the remaining jam for dinner, what fraction of the jam was left after dinner?	Choose the correct choice from the following options:
A) 2/7
B) 3/7
C) 4/7
D) 9/14
E) 11/14
Let x be the amount of jam at the beginning.   After lunch, the remaining jam was (2/3)x.   After dinner, the remaining jam was (6/7)(2/3)x = (4/7)x.   The answer is 4/7.
<result>C</result>
Jen has a jar of jam, and she ate 1/3 of the jam for lunch. If Jen ate 1/7 of the remaining jam for dinner, what fraction of the jam was left after dinner?