You have 105 pens and 147 pencils, and you want to use them all. what is the greatest number of these sets you can make?

Hey there!

To find the answer to this problem, all you need to do is find the greatest common factor between these two numbers. In this case, it's 21. You can multiply 21 by two different numbers to get 105 and 147. When you divide 105 by 21, you get 5 pens. When you do the same with 147, you get 7. 

The greatest number of sets you could make is 21. Each set will come with 5 pens and 7 pencils. 

Hope this helped you out! :-)

Hello!

the answer is:

the correct option is the option b.

why?

to calculate the surface area of the right cylinder, we need to use the following formula:

from the picture we know that:

so, substituting and calculting we have:

hence, we have that the correct option is the option b.

have a nice day!