Q12: A certain liquid leaks out of a container at the rate of k liters for every x hours. If the liquid costs $6 per liter, what is the cost, in dollars, of the amount of the liquid that will leak out in y hours? A. ky/ 6x
B. 6x/ky C. 6k/xy D. 6ky/x E. 6xy/k 请教这题如何列出算式的呢？ | 
