Mình học bài này tên là Assuming ở Stemhouse nhớ
A pig and a cow have 4 legs each and a chicken and ducks have 2 legs each.
The number of pigs and chickens:
90 : 2 = 45 ( pigs and chickens )
The number of legs of pigs and chickens:
256 : 2 = 128 ( legs )
The number of legs if all of them are chickens:
45 x 2 = 90 ( legs )
The difference between the original and new number:
128 - 90 = 38
The difference between the number of legs a pig has and a chicken has:
4 - 2 = 2 ( legs )
The number of chickens:
38 : 2 = 19 ( chickens )
The number of pigs:
45 - 19 = 26 ( pigs )
Ans: Pigs and cows: 26 each
Chickens and ducks: 19 each
Wow, trùng hợp làm sao là mình đang làm bài này luôn