On average, seawater contains approximately 1.2 ounces of salt per liter. how many gallons of seawater to the nearest tenth of a gallon would contain 2.5 pounds of salt?

10.6

Step-by-step explanation:

The amount of salt in one liter is 1.2 ounces, meaning to make one pound (16 oz) it would take 13 1/3 liters of water.

For 2.5 pounds, it would be 2.5*16, or 40-- 40 liters for 2.5 pounds of salt.

40 liters in (U.S.) gallons is 40/ (approximately) 3.785 , or 10.5680, 10.6