During the May Day period, a clothing store promoted sales, and all the goods were sold at a discount. A sportswear with a price of 180 yuan saved 36 yuan compared with the price after the discount How much discount?

During the May Day period, a clothing store promoted sales, and all the goods were sold at a discount. A sportswear with a price of 180 yuan saved 36 yuan compared with the price after the discount How much discount?

(180-36)/180=0.8
So I gave a 20% discount

Hongtu clothing store bought 315 sets of sportswear, brother sold 2 / 7 of all sportswear in one week, sold the remaining 2 / 5 in the second week, how many sets are left

（315-315*（2/7））*（1-2/5）

I bought a bottle of orange juice, which weighs 2.3 kg. After half of the orange juice is drunk, the whole bottle weighs 1.2 kg. How many kg is the orange juice? How many kg is the bottle?

Orange juice: (2.3-1.2) × 2 = 2.2kg
Bottle: 2.3-2.2 = 0.1kg

Pour a glass out of a bottle containing 1500ml orange juice. The remaining orange juice in the bottle is 800ml more than that in the cup. Now how many decibels are there in the bottle and in the cup
If we do it by solving the equation, there is only one unknown number & nbsp;