Home > CCG > Chapter 9 > Lesson 9.1.4 > Problem9-45

9-45.

Koy is inflating a spherical balloon for her brother’s birthday party. She has used three full breaths so far and her balloon is only half the width she needs. Assuming that she puts the same amount of air into the balloon with each breath, how many more breaths does she need to finish the task? Explain how you know.

If she needs the balloon to double in width, then the volume will increase by a factor of $8$.

$3(8)=24$ total breaths needed. She needs $21$ more breaths $(24 − 3)$.