Test points

A test has 20 questions. The test awards 3 points if the answer is correct and takes away 1 point if the answer is incorrect. A student answered five questions incorrectly. How many points did the student earn?​

Correct answer:

x =  40

Step-by-step explanation:

n=20 i=5 c=ni=205=15  x=c 3i 1=15 35 1=40

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