Which number should be added to 3, 11, 4 and 14 to make them in proportion?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 1.
Let x be added:
(3 + x)/(11 + x) = (4 + x)/(14 + x)
Cross-multiply:
(3 + x)(14 + x) = (4 + x)(11 + x)
⇒ 42 + 17x = 44 + 15x
⇒ 2x = 2 ⇒ x = 1