When a particular number is subtracted from each of 7, 9, 11 and 15, the resulting numbers are in proportion. The number to be subtracted is -
A. 1
B. 2
C. 3
D. 5
Answer: Option C
Solution(By Examveda Team)
Let the required number be xThen,
$$ = \frac{{7 - x}}{{9 - x}} = \frac{{11 - x}}{{15 - x}}$$
⇒ (7 - x)(15 - x) = (11 - x)(9 - x)
⇒ 105 - 22x + x2 = 99 - 20x + x2
⇒ 2x = 6
⇒ x = 3
Related Questions on Ratio
If a : b : c = 3 : 4 : 7, then the ratio (a + b + c) : c is equal to
A. 2 : 1
B. 14 : 3
C. 7 : 2
D. 1 : 2
If $$\frac{2}{3}$$ of A=75% of B = 0.6 of C, then A : B : C is
A. 2 : 3 : 3
B. 3 : 4 : 5
C. 4 : 5 : 6
D. 9 : 8 : 10
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