Final answer:
Sylvia weighed 8 pounds when she was born. By her second birthday, she had gained 12 more pounds. Her father weighed 5 times as much as she did. The combined weight of Sylvia and her father is 216 pounds.
Step-by-step explanation:
Sylvia weighed 8 pounds when she was born. By her first birthday, her weight had tripled and she weighed 24 pounds. By her second birthday, she had gained 12 more pounds, so she weighed 36 pounds. At that time, Sylvia's father weighed 5 times as much as she did, which means he weighed 5 * 36 = 180 pounds. The combined weight of Sylvia and her father is 36 + 180 = 216 pounds.