2 (3a+2) = -8 (Solve using distributive property

I think the answer is a= -2.

Step-by-step explanation:

60% of the members are men and average age of men is 32 years old.
⇒ 60% of the members are 32 years old.

40% of the members are women and the average age of women is 28 years old.
⇒ 40% of the members are 28 years old.

Average age = 0.6 x 32 + 0.4 x 28 
Average age = 19.2 + 11.2
Average age = 30.4