The original price of Mengniu milk is 3 yuan per box. During the activity, "buy five get one free". If you buy 120 boxes, how much does it cost? How much is equivalent to a discount? The perimeter of a rectangle is 92cm. If its length decreases by 1 / 3 and its width increases by 5 / 8, then its perimeter remains unchanged. What is the area of the rectangle?

The original price of Mengniu milk is 3 yuan per box. During the activity, "buy five get one free". If you buy 120 boxes, how much does it cost? How much is equivalent to a discount? The perimeter of a rectangle is 92cm. If its length decreases by 1 / 3 and its width increases by 5 / 8, then its perimeter remains unchanged. What is the area of the rectangle?

Buy five and get one free. If you buy 120 boxes, you only need to buy 100 boxes, and the remaining 20 boxes are free. In this way, the total cost is 300 yuan. The original price is 360, which is about 85% off
Let the length be x and the width be y
2X+2Y=92
2(2/3X+13/8Y)=92
The length is 30 and the width is 16

There is a discount in the supermarket today, 10% discount for more than five bottles of milk. Mom bought 8 bottles of milk at the original price of three yuan per bottle, how much do you need to pay?
It's 21.6 yuan, but it's still wrong,

3×8×90%
=24÷90%
=21.6 yuan
Right

Supermarket milk to buy five free a can, my mother would like to buy 13 cans, 3 yuan per can, how much does my mother need to pay?

13 △ 5 + 1, = 13 △ 6, = 2 (pieces) 1 (pot). 5 × 2 + 1, = 10 + 1, = 11 (pot), 3 × 11 = 33 (yuan). Answer: mother only needs to pay 33 yuan

Mother bought two boxes of milk. The big box is twice as big as the small one. How many kilos of each box?

Suppose the small box has x kg, then the large box has 2x kg, x + 2x = 0.75 & nbsp; 3x = 0.75 & nbsp; X = 0.250.25 × 2 = 0.5 (kg) a: the small box has 0.25 kg, and the large box has 0.5 kg of milk