Overlapping Sets - WP strategy guide MGMAT (Q-7)

[aashray.thatai]

Q- 10% of aliens are capable of intelligent thought and have more than 3 arms ,and 75% of aliens with 3 arms or less are capable of intelligent thought . If 40% of all aliens are capable of intelligent thought , what percent of aliens have more than 3 arms?

I need help solving this problem in a systematic way.
This is what i did
- Created a table that had intelligent/ not intelligent and <=3 and >=3.
- Assumed total number of aliens =100
-im getting confused between total number and total number of aliens capable of intelligent thought ? how would i name that quantity .
Please help thanks

[RonPurewal]

Hello,
Please post this question in the correct folder (= MGMAT non-CAT math folder).

Thanks.