Answer:
1 1/6 gallons
Step-by-step explanation:
He starts with 3 1/2 gallons.
He uses 2/3 of the 3 1/2 gallons to paint his bedroom.
The amount left is 1/3 of 3 1/2 gallons.
Hew uses the amount left for the mural.
1/3 of 3 1/2 = 1/3 × 3 1/2 = 1/3 × 7/2 = 7/6 = 1 1/6
Answer 1 1/6 gallons