Answer:
The current weight of the cat is w, and we know that when the cat doubles the weight, it will weight 10 pounds
Then we can write the equation
2*w = 10 pounds
Now we can solve this for w, we must divide by 2 in both sides of the equality.
2*w/2 = 10/2 pounds
w = 5 pounds
The actual weight of the cat is 5 pounds.