A rectangular glass jar is 6 decimeters long, 5 decimeters wide, 3 decimeters high, and 2.8 decimeters deep. If a stone with a volume of 27 cubic decimeters is placed in FRP, how many liters of water will escape? (Use equations or calculations)

27-(3-2.8)*5*6=21 liters

Put three boxes of candies 20 cm long, 15 cm wide and 5 cm high Wrapped together, how can we use the most economical wrapping paper (calculations, equations)

20*15=300cm? 20*5=100cm? 15*5=75cm?

So The most cost-effective wrapping paper for noodles with an area of ??300cm? is (301075)*2*3-300*4=1650cm?

Canteen Friday menu: meat dishes (meatballs, shrimps), Vegetarian dishes (winter melon, tofu, cabbage), each student can choose one meat dish, one vegetarian dish, and there are (2*3=6) kinds of side dishes.

A cuboid becomes a cube after its height is shortened by 1.5 centimeters. Its surface area is reduced by 30 square centimeters. The original volume of the cuboid is (162.5) cubic centimeters

30/(1.5 *2) = 10cm? = length plus width. Because the length and width are equal, they are equal to 5. The original height is 5+1.5=6.5

Volume = 6.5*5*5=162.5cm?