The answer is 16 use pendas
Simply find the total medium cofees sold
then divide that by the number of medium cofees that weren't caffeinated
so..

then

so x will be 1.5 & 100 ÷ 1.5 = 66.666...
rounded is 67%
If A varies directly with z, and A is 30 and z is 5, then when z is 1, A is 6.
z: 5 ÷ 5 = 1
A: 30 ÷ 5 = 6
Then, when z is 1, A is 6
So, when z is 9, A is...
z: 1 × 9 = 9
A: 6 × 9 = 54
A is 54