The number to be added to each of the numbers 7, 16, 43, 79 to make the numbers in proportion is = ?
A. 2
B. 3
C. 5
D. 1
Answer: Option C
Solution(By Examveda Team)
7, 16 , 43, 79If a, b, c, d are in proportion
⇒ a : b :: c : d
Then ad = bc
Let x is added to make it a proportion
⇒ (7 + x) : (16 + x) :: (43 + x) : (79 + x)
⇒ (7 + x)(79 + x) = (16 + x)(43 + x)
∴ x2 + 86x + 553 = x2 + 59x + 688
⇒ 27x = 135
⇒ x = 5
∴ Hence, it 5 is added to make it a proportion
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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