Each garden that Mancino tends measures 16 feet by 5 feet, so the area of each garden is 16 * 5 = 80 square feet.
Mancino tends x gardens, so the total area of the gardens he tends is x * 80.
Each garden that Marquita tills measures 8 feet by 4 feet, so the area of each garden is 8 * 4 = 32 square feet.
Marquita tills 2 gardens, so the total area of the gardens she tills is 2 * 32 = 64 square feet.
The combined area of all the gardens is the sum of the area of the gardens Mancino tends and the area of the gardens Marquita tills: x * 80 + 64.
We are given that the combined area is 304 square feet, so we can write: x * 80 + 64 = 304.
Subtracting 64 from both sides, we get: x * 80 = 240.
Dividing both sides by 80, we get: x = 3.
The value of x is 3.
#### 3
The answer is: 3
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Mancino is tending x gardens that each measure 16 feet by 5 feet. His sister, Marquita, is tilling the soil for two gardens that each measure 8 feet by 4 feet. How many square feet combined are in all their gardens?
If we know the answer to the above question is 304, what is the value of unknown variable x?

### Answer:
