Imagine all the buttons are divided into 4 parts. 3 out of the 4 parts are red. HALF of this 3 parts are round. So if you want the buttons that are round and red, you use 3/4 and you halve it. In other words, 3/4 x 1/2 which will give you 3/8 (buttons that are red and round). Try to solve Question 6 by using the same method. Hope this helps :)