retagged by
892 views

2 Answers

Best answer
1 votes
1 votes
Ans is option (B)

Let the milkman sells $1$L of milk originally at Rs $100$

Let him mix $’x’$ L of water in the mixture. Then, total volume of mixture is now  $’x+1’$ L

Now, he would have gained Rs $100$ on selling  pure milk. But now, with $’x+1’$ L of impure milk, he got Rs $125$ i.e. Rs $25$ extra.

$\therefore$   $1$ L  $\rightarrow$  Rs $100$

      $’x+1’$ L  $\rightarrow$   Rs $125$

$\therefore$  $100(x+1)=125$   $\Rightarrow$  $x=\frac{1}{4}$ L

$\therefore$ Percentage of water in the current mixture  $=$   $\frac{\frac{1}{4}}{\frac{1}{4}+1}\times100=20$%
selected by
1 votes
1 votes
Answer is B.

Suppose, 100 litres of milk costs Rs.100, 100 litres of milk is sold at 25% profit, so he would have sold it for Rs.125.

As water doesn't have any cost, water added by him will be 125 – 100 = 25 litres [1 litre milk cost Rs.1].

100 litres of milk and 25 litres of water added, so mixture now became 125 litres.

The percentage of water in the mixture is $\frac{25}{125} * 100 = 20$%

Related questions

0 votes
0 votes
1 answer
1
Lakshman Bhaiya asked Apr 3, 2020
641 views
In an examination, $52\%$ of the candidates failed in English, $42\%$ in Mathematics and $17\%$ in both. The number of those who passed in both the subjects, is :$83\%$$2...
0 votes
0 votes
1 answer
2
Lakshman Bhaiya asked Apr 3, 2020
804 views
$5\%$ income of $A$ is equal to $15\%$ income of $B$ and $10\%$ income of $B$ is equal to $20\%$ income of $C$. If income of $C$ is ₹ $2000$, then total income of $A, B...
0 votes
0 votes
1 answer
3
Lakshman Bhaiya asked Apr 3, 2020
709 views
A man sells an article at a gain of $15\%$ Had he bought it at $10\%$ less and sold it for ₹ $4$ less, he would have gained $25\%$. The cost price of the article is :�...
0 votes
0 votes
0 answers
4
1 votes
1 votes
1 answer
5
Lakshman Bhaiya asked Apr 3, 2020
592 views
If $ x^{a}=y^{b}=z^{c} $ and $ y^{2}=zx $ then the value of $ \frac{1}{a} + \frac{1}{c}$ is :$ \frac{b}{2}$$ \frac{c}{2}$$ \frac{2}{b}$$ \frac{2}{a}$