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We are given:

• Total solution = 8 litres

• Acid concentration = 20%

We are to find: how many litres of pure acid are present in this solution.

🧠 Concept:

To find the amount of pure acid in a solution:

$$\text{Pure acid}=\text{Percentage strength}\times \text{Total volume}$$

🔢 Step-by-step Calculation:

Pure acid=20100×8=0.2×8=1.6 litres\text{Pure acid} = \frac{20}{100} × 8 = 0.2 × 8 = 1.6 \text{ litres}Pure acid=10020​×8=0.2×8=1.6 litres

✅ Final Answer:
There are 1.6 litres of pure acid in 8 litres of a 20% solution.

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We are given:

• Kamal invested ₹9000 for 12 months

• Sameer invested ₹8000 but joined after 5 months ⇒ so he invested for (12 − 5) = 7 months

• Total profit = ₹6970

• We are to find Sameer’s share of the profit

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🟢 Step 1: Calculate profit-sharing ratio
Profit is shared in the ratio of (Capital × Time)

Kamal’s share = 9000 × 12 = 108000
Sameer’s share = 8000 × 7 = 56000

Now simplify the ratio:

Kamal : Sameer = 108000 : 56000
Divide both by 1000 ⇒ 108 : 56
Simplify further: divide both by 4 ⇒ 27 : 14

So the profit-sharing ratio is:

➡️ Kamal : Sameer = 27 : 14

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🟢 Step 2: Total parts = 27 + 14 = 41 parts
Sameer’s share = (14 / 41) × 6970

Now calculate:

1441×6970=9758041=2380\frac{14}{41} × 6970 = \frac{97580}{41} = 23804114​×6970=4197580​=2380

✅ Final Answer:
Sameer’s share of the profit is ₹2,380.