1 questions
A large metal ball with a radius of 15 cm is melted down to make smaller metal balls with a radius of 5 cm. How many of these smaller metal balls can be made?
Large metal ball =4/3 (π)(r^3) with r = 15 cm
=4/3*3.142*15^3 =14139 cm^3
Small metal ball = 4/3 (π)(r^3) with r = 5 cm
=4/3*3.142*5^3 =523.667 cm^3
Number of Small Metal Balls = 14139 / 523.667 = 27 Balls
Your difficult questions, answered
Our tutors get asked all sorts of hard questions in their tutorials. They use this page to write up the most common questions so you can access them for free.
Wondering how iProTutor works?
Here's a two minute explanation.
Frequently asked questions