Answer:
W x 3 = 64
Explanation:
Let x be the dog's weight when he was 6 months old. Since the dog's weight is 3 times as heavy now, we can say: w = 3x But we also know that the current weight of the dog is 64 pounds, so we can substitute w = 64: 64 = 3x Dividing both sides by 3, we get: x = 21.33 Therefore, the equation to find the dog's weight when he was 6 months old is: x = 21.33