『数学题』新加坡的数学题,超难!1）In a farm,there are cows and chickens which have a total of 86 eye and 142 legs.How many cows and chickens are there?2)A weightlifter puts one large and one small iron disc on each side of a lifting roa

Question

『数学题』新加坡的数学题,超难!
1）In a farm,there are cows and chickens which have a total of 86 eye and 142 legs.How many cows and chickens are there?
2)A weightlifter puts one large and one small iron disc on each side of a lifting road which,by itself,weighs 6kg.Now the total mass is 150kg.Then he adds one more small iron disc on each side and yjis time,it weighs 202kg.What is the mass of each of the large and small iron disc?
必须写出method 和算法,普通算式是不被接受的,知道者请快速回答,
ps:
2)第三行，写错字，each side and this time.

Answer 1

第一题：牛2眼4腿,鸡2眼2腿总共86眼 142腿~~ 设鸡X 牛Y则 2X+2Y=86 2X+4Y=142解得X=15 Y=28 第二题：设large iron重X kg small iron重 Y kg由这句 puts one large and one small iron disc on each side...