12 out of 15 can also be written as [tex] \frac{12}{15} [/tex]
Then, it your calculator, do 12/15 (12 ÷ 15)
I got 0.8
Then you get its percentage (multiply it by 100)
The percentage not missed it 80%, so the percentage missed should be 20%.
(100% - 80% = 20%)
