If three pounds of apples costs $5.25, how much will 10 pounds cost?

To solve this problem, we need to find the cost per pound of apples.

To find the cost per pound, we divide the total cost by the number of pounds: $5.25 / 3 pounds = $1.75 per pound.

To find the cost of 10 pounds, we multiply the cost per pound by the number of pounds: $1.75 per pound * 10 pounds = $17.50.

Therefore, 10 pounds of apples will cost $17.50.