How much pure alcohol must be added to of a solution to make its strength

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

90 ml

100 ml

125 ml

60 ml

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Concept- The idea of percentages will be applied in this question. The following equation describes the relationship between a substance's percentage and amount in a mixture:
Question Image

Now that we know that a 400 mL solution contains 15% alcohol at first, let's move on. Using the formula, we will first determine how much alcohol is present in the original solution. If there is v mL of alcohol, then-

This is the initial alcohol content. Let's now imagine that the solution receives an addition of x ml of alcohol. The new volumes of the alcohol and solution are respectively 60+x and 400+x. It is assumed that this solution has a 32 percent strength. The resulting equation is as follows:

Therefore,

of alcohol should be added to make the strength

Hence, the correct answer is option 2.
Syllabus: CBSE

Watch 3-min video & get full concept clarity

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

How to Join IIT after 10th

Get Expert Academic Guidance – Connect with a Counselor Today!

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

How to Join IIT after 10th