If 3,x,12 and 2x + 7 are in proportion, then 6x is:
Show answer & explanation
Correct answer: C
Explanation
The Correct answer is option 3 i.e. 21.
Given that
If 3, x, 12, and 2x + 7 are in proportion
According to the question;
⇒ 3/x = 12/(2x + 7)
⇒ 3 × (2x + 7) = 12x
⇒ 6x + 21 = 12x
⇒ 12x - 6x = 21
⇒ 6x = 21