**GMAT Prep**

If the sum of 5, 8, 12, and 15 is equal to the sum of 3, 4, x, and x+3, what is the value of x?

A. 14

B. 15

C. 16

D. 17

E. 18

OA B

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Given: 5 + 8 + 12 + 15 = 3 + 4 + x + (x+3)

Simplify: 40 = 2x + 10

Subtract 10 from both sides: 30 = 2x

Divide both sides by 2: 15 = x

Answer: B