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Question

In mixture A, there is 5 L of syrup in 6 L of water. In mixture B, there is 3.5 L of syrup in 5.5 L of water. In which of the two mixtures is the concentration of syrup greater?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
A

To determine which mixture has a greater concentration of syrup, we need to calculate the concentration for each mixture.

Calculate Syrup Concentration for Mixture A

Mixture A contains 5 L of syrup and 6 L of water.

  • Total volume of Mixture A = Volume of Syrup + Volume of Water
  • Total volume of Mixture A = 5 L + 6 L = 11 L
  • Concentration of syrup in A = $ \frac{\text{Volume of Syrup}}{\text{Total Volume}} \times 100\% $
  • Concentration of syrup in A = $ \frac{5 \text{ L}}{11 \text{ L}} \times 100\% \approx 45.45\% $

Calculate Syrup Concentration for Mixture B

Mixture B contains 3.5 L of syrup and 5.5 L of water.

  • Total volume of Mixture B = Volume of Syrup + Volume of Water
  • Total volume of Mixture B = 3.5 L + 5.5 L = 9 L
  • Concentration of syrup in B = $ \frac{\text{Volume of Syrup}}{\text{Total Volume}} \times 100\% $
  • Concentration of syrup in B = $ \frac{3.5 \text{ L}}{9 \text{ L}} \times 100\% \approx 38.89\% $

Compare Concentrations and Conclude

Comparing the concentrations:

  • Mixture A concentration ≈ 45.45%
  • Mixture B concentration ≈ 38.89%

Since 45.45% is greater than 38.89%, the concentration of syrup is greater in Mixture A.

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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.

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  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. 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.

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