Drink one and a half of a bottle of mineral water, and then drink the remaining one and a half. How much is the last? How much is the last?

Drink one and a half of a bottle of mineral water, and then drink the remaining one and a half. How much is the last? How much is the last?

（1*1/2*1/2）+1/2=3/4

A, B two shopping malls are promoting a fresh juice, a shopping mall: buy a big bottle get a small bottle free. B shopping mall: over 45 yuan 20% discount. 61 class 40 students
Class 61 40 students go for an autumn outing. They need to prepare 200ml juice for each student. Which shopping mall is cheap? Large bottle 1200ml 15 yuan, small bottle 200ml 3 yuan
specific

40 students for autumn outing, each 200ml juice, a total of 40 * 200 = 8000ml juice
Department store a:
Large bottle + small bottle = 1400ml
8000/1400=5.7
Buy 5 large bottles and get 5 small bottles free: 5 * (1200 + 200) = 7000ml
8000-7000=1000ml
1000 / 200 = 5 bottles
You need to buy five big bottles and five small bottles of juice, 15 * 5 + 3 * 5 = 90 yuan
Shopping mall B:
8000/1200=6.6
8000-6*1200=800ml
800 / 200 = 4 bottles
You need to buy six large bottles and four small bottles of juice, a total of 15 * 6 + 4 * 3 = 102 yuan
Over 45 yuan, 20% discount, you need to spend 102 * 0.8 = 81.6 yuan
81.6 is less than 90, so B is cheaper

A and B shopping malls are promoting a fresh fruit juice. A shopping mall will get a small bottle for each bottle. B shopping mall will get a 20% discount of 45 yuan. There are 40 people in class 6 (1)

How much should 40 people drink: 200 △ 40 = 8000 (ML) a: 1200 + 200 = 1400 (ML) 8000 △ 1400 = 5.7 5×（1200+200）=7000（ml） 8000-7000=1000（ml）
1000 △ 200 = 5 (bottle) 15 × 5 + 3 × 5 = 90 (yuan)
B: 8000 △ 1200 = 6.6
8000-6÷1200=800（ml）
800 △ 200 = 4 (bottle)
15 × 6 + 4 × 3 = 102 (yuan) 102 × 80% = 81.6 (yuan)
81.6＜90
A: B is cheap

How many jin is 1500 ml

3 jin