The total weight of a dog and a cat is 15.4 kg.The dog is six times as heavy as the cat.
Jenny's father is now 35 years old.Five years later, he will be 4 times as old as Jenny then
Mathematic
2006-10-20 4:30 am
回答 (2)
2006-10-20 4:39 am
✔ 最佳答案
A very simple algebric question:Let x be the weight of the cat,
let y be the weight of the dog
x+y=15.4;--------------(1)
6x=y; --------------(2)
sub 2 into 1, we get
7x=15.4
x=2.2
therefore, y=13.2
Therefore, the weight of a dog is 13.2 kg while the weight of the cat is 2.2 kg
2006-10-19 20:43:03 補充：
Question 2:Let x be the age of Jenny,35 5 = 4xx=10,Therefore, Jenny is 10 years old now
2006-10-20 4:39 am
let x be cat's weight
x+6x=15.4
7x=15.4
x=2.2
the cat is 2.2kg & the dog is (2.2)6=13.2kg
let y be jenny's old
4y-5=35
4y=40
y=10
x+6x=15.4
7x=15.4
x=2.2
the cat is 2.2kg & the dog is (2.2)6=13.2kg
let y be jenny's old
4y-5=35
4y=40
y=10
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