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Answer on Algebra Question for Mikayla

Question #20293
Christos scored 80% in his automotive exam. There were 25 questions.

a. how many questions did he get right?
b. How many questions did he get wrong?
Expert's answer
Christos scored 80% in his automotive exam. There were 25 questions.
&
a. how many questions did he get right?

As Christos scored 80% of all the questions, then he got right

R = 25 * (80%/100%) = 25 * 0.8 = 20

questions.

b. How many questions did he get wrong?

As Christos scored 80% of all the questions, then he failed 100%-80% = 20% of them and so he got wrong

R = 25 * (20%/100%) = 25 * 0.2 = 5

questions.

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