Subject: mathqa
Question: a farm has chickens , cows and sheep . there are 6 times the number of chickens and cows than sheep . if there are more cows than chickens or sheep , and together , cows and chickens have a total of 100 feet and heads , how many sheep live at the farm ?
Option: 
A: 4
B: 10
C: 8
D: 17
Answer: A