If x + 2y – 3z = 5 and 2x + 2y + 3z = 8, then 9x + 12y = ? GMAT Problem Solving

Question: If x + 2y – 3z = 5 and 2x + 2y + 3z = 8, then 9x + 12y = ?

(A) 15
(B) 23
(C) 31
(D) 39
(E) It cannot be determined.

Approach Solution 1

Approach Solution 2

Approach Solution 3

“If x + 2y – 3z = 5 and 2x + 2y + 3z = 8, then 9x + 12y = ?” - is a topic of the GMAT Quantitative reasoning section of GMAT. This question has been taken from the book “GMAT Official Guide Quantitative Review”. To solve GMAT Problem Solving questions a student must have knowledge about a good amount of qualitative skills. The GMAT Quant topic in the problem-solving part requires calculative mathematical problems that should be solved with proper mathematical knowledge.

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