Question

katie is solving brain teasers she solve 6 brain teasers in 72 minutes how long did she spend on each brain teaser

Answer 1

72 divided by 6 = 12.

Katie spent 12 minutes on ezch

Answer 2

To find how many minutes she took per brain teaser, divide the time by how many she did.
72/6=12 
She spent 12 minutes on average for each brain teaser. 
Hope this helps.