The concentration of three wines A, B and C are 10%, 20% and 30%, respectively. They are mixed in the ratio 2 ∶ 3 ∶ x resulting in a 23% concentration solution. Find the value of x.
- AOption (a)
5
- BOption (b)
8
- COption (c)
6
- DOption (d)
7
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Correct answer
5
Why this answer is correct
Given:
Concentration of wine A = 10%
Concentration of wine B = 20%
Concentration of wine C = 30%
Ratio of mixing = 2 ∶ 3 ∶ x
Resulting concentration = 23%
Formula used:
Weighted average concentration = (CA × WA + CB × WB + CC × WC) / (WA + WB + WC)
Where CA, CB, and CC are concentrations of A, B, and C respectively, and WA, WB, and WC are weights of A, B, and C respectively.
Calculation:
Let weights be 2, 3, and x respectively.
Resulting concentration = (10 × 2 + 20 × 3 + 30 × x) / (2 + 3 + x)
⇒ 23 = (20 + 60 + 30x) / (5 + x)
⇒ 23 × (5 + x) = 80 + 30x
⇒ 115 + 23x = 80 + 30x
⇒ 115 - 80 = 30x - 23x
⇒ 35 = 7x
⇒ x = 5
∴ The value of x is 5.
























































