Answer:
2700 bushels
Step-by-step explanation:
First of all we have to calculate the square storage bin volume:
Square storage bin volume= Side*Side*Side
<em>Remember that in a square storage bin (cube) the sides are the same length.</em>
Then:
Square storage bin volume= Side*Side*Side
Square storage bin volume= 15 feet*15 feet*15 feet
Square storage bin volume= 3375 
We know that 1 bushel fits in 1.25 cubic feet, then in order to calculate how many bushels the square storage bin contain:
3375
* (1 bushel)/(1.25
)
2700 bushels