Question

- A cat and a dog together weigh 21kg.
The dog is twice as heavy as the cat.
How much does the cat weigh?​

Answer 1

Answer:7 kg

Step-by-step explanation:

Let the weight be,x

Wieght of cat =x

Wieght of dog = 2x (as in the questio written)

x+2x=21 kg

3x=21 kg

21/3 =x

Cat = 7 kg

Dog =14 kg

Answer 2

Answer:

Let the weight of cat be x

and dog be y

so x+y= 21

x=2y

2y+y=21

3y=21

so, y=7

x=14