Respuesta :

FiftyDub

Answer: 4

Step-by-step explanation:

80% of 20 = 16

20-16= 4

iamathing

Answer:

4

Step-by-step explanation:

[tex]\frac{x}{20}=\frac{80}{100}[/tex]

cross multiply

[tex]100x=1600[/tex]

[tex]x=16[/tex]

so, now that you know he got 16 correct, you know that he missed 4