Answered

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A college student completed some courses worth 3 credits and some
courses worth 4 credits. The student earned a total of 5% credits after
completing 18 courses. How many courses worth 3 credits did the student
complete?
A. 13
B. 5
C. 20
D. 39

Sagot :

mhanifa

Answer:

  • A. 13

Step-by-step explanation:

Note: It seems typo in the question. 5% should read 59.

Let 3 credit courses = x, 4 credit courses = y

As per  given we have following equations:

  • x + y = 18
  • 3x + 4y = 59

Solve the system by elimination. Multiply the first equation by 4 and subtract the second one:

  • 4(x + y) - (3x + 4y) = 4(18) - 59
  • 4x + 4y - 3x - 4y = 72 - 59
  • x = 13

The answer is 13

Correct choice is A

I think its A.

the answer is 12.9045.

which is close to 13.

I hope this helps.

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