What should be subtracted from 7, 9, 8, 11 so that the remaining numbers may be proportional?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 5.
Let the number be subtracted = x
(7 – x)/(9 – x) = (8 – x)/(11 – x)
⇒ 77 – 18x + x2 = 72 – 17x + x2
⇒ 77 – 18x = 72 – 17x
⇒ x = 5