Final answer:
Penny's dad is estimated to be about 150 inches tall.
Step-by-step explanation:
To estimate how tall Penny's dad is, we can use a ratio. Let's assume that Penny's dad is about six times taller than Penny. To find his height, we can multiply Penny's height by 6.
25 inches * 6 = 150 inches
Therefore, Penny's dad is estimated to be about 150 inches tall.