Question

300 gms of salt solution has 40% salt in it. How much salt should be added to make it 50% in the solution?

• A. 40 gms
• B. 60 gms
• C. 70 gms
• D. 80 gms

Hint:

The non-salt part of the solution stays the same when you add pure salt, use that to find the new total weight.

Answer 1

The Correct Option is B

Here is a quicker route using the non-salt part, which never changes when you add pure salt.

1. Non-salt part stays fixed: at 40% salt, the non-salt part is 60% of 300 gm, which is 180 gm, and it stays 180 gm after adding salt.
2. Use the target percentage: at 50% salt, salt and non-salt parts are equal, so the new total must be exactly twice the non-salt part.
3. Find the new total: new total = 2 times 180 = 360 gm.

Salt added = 360 minus 300 = 60 gm, which matches option B.

Let's summarize:

• When you add pure salt, only the salt amount changes, so anchoring on the fixed non-salt weight skips the fraction equation.

Both routes confirm the answer is 60 gm.