One package of water plants is recommended for 3000 cubic centimeters of water in a fish tank. How many packages of plants will be needed for a 45cm by 70cm tank that is filled to a depth of 10cm?

please show work.

V = LWH

V = 45 * 70 * 10

V = 31,500 cubic cm

Divide 31,500 by 3,000 to find the number of packages.