Vicky bought 3 1/2 pounds of oranges. Each pound costs $3.90. Which of the following equations represents the total cost, c, Vicky paid for the oranges and the amount of money she spent?

Options:
3.90/3.5 = c; Vicky paid $13.65
c/3.5 = 3.90; Vicky paid $13.65
c/3.90 = 3.5; Vicky paid $1.11
3.90c = 3.5; Vicky paid $0.90

The correct equation is: c = 3.90 * 3.5

This equation represents the total cost, c, that Vicky paid for the oranges. The amount of money she spent is equal to the cost per pound, $3.90, multiplied by the number of pounds, 3.5.