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Question

15 kg of ₹10 per kg wheat is mixed with 5 kg of another type of wheat to get a mixture costing ₹30 per kg. Find the price (per kg) of the costlier wheat.

The correct answer is

90

Given:

  • 15 kg of wheat costing ₹10 per kg
  • 5 kg of another type of wheat
  • The cost of the mixture is ₹30 per kg

Let the price per kg of the costlier wheat be x.

Step-by-step Calculation:

The total cost of the 15 kg of wheat at ₹10 per kg is:

15 × 10 = ₹150

The total cost of the 5 kg of the costlier wheat is:

5 × x = 5x

The total weight of the mixture is 15 + 5 = 20 kg.

The total cost of the mixture is:

150 + 5x

The price per kg of the mixture is ₹30, so the total cost of the mixture is also:

20 × 30 = ₹600

Set up the equation:

150 + 5x = 600

Solving for x:

  1. 5x = 600 - 150
  2. 5x = 450
  3. x = 450 ÷ 5 = 90

Conclusion:

The price per kg of the costlier wheat is ₹90.

The correct answer is:

Option 1: ₹90

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Important Questions from Mixture and Alligation

  1. My father is presently 25 years older than me. The sum of our ages 5 years ago was 39 years. Find my present age.

  2. Rice worth ₹43/kg and ₹67/kg are mixed with a third variety in the ratio 2 : 1 : 5. If the mixture is worth ₹96/kg, the price (in ₹) of the third variety of rice per kg will be:

  3. 42 litres of milk at ₹25 per litre is mixed with 28 litres of milk at ₹40 per litre. Find the average price of the mixture.

  4. If a + b + c = 0, then the value of (a² + b² + 2ab) is equal to:

  5. Simplify:

    25 - (18 - 4 × 9 ÷ 3)

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