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Question

In a blend of apple juice and orange juice, 20% was apple juice. In another blend of the two juices, 30% was orange juice. The two blends are mixed in a certain ratio so that the ratio of apple juice and orange juice in the mix was 4 : 3. Find the ratio of the first blend and the second blend, in that order, in the final mix.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
9 : 26

Blend Ratio Calculation: Apple and Orange Juice Mix

This problem requires finding the ratio in which two different juice blends are mixed to achieve a specific final ratio of apple juice to orange juice.

Understanding the Blends

  • Blend 1: Contains 20% apple juice, which means it contains 80% orange juice.
  • Blend 2: Contains 30% orange juice, which means it contains 70% apple juice.
  • Final Mix: The resultant mixture of Blend 1 and Blend 2 has a ratio of apple juice to orange juice of 4:3.

Setting up the Equation for Mixing

Let $x$ represent the quantity of the first blend and $y$ represent the quantity of the second blend used in the final mix. The goal is to determine the ratio $x : y$.

Calculate the contribution of apple and orange juice from each blend:

  • From Blend 1 ($x$ units): Apple Juice = $0.20x$, Orange Juice = $0.80x$.
  • From Blend 2 ($y$ units): Apple Juice = $0.70y$, Orange Juice = $0.30y$.

In the combined final mix:

  • Total Apple Juice = $0.20x + 0.70y$
  • Total Orange Juice = $0.80x + 0.30y$

The problem states that the ratio of total apple juice to total orange juice in the final mix is 4:3.

This gives us the equation:

$ \frac{0.20x + 0.70y}{0.80x + 0.30y} = \frac{4}{3} $

Solving for the Blend Ratio

We solve the equation to find the ratio $x : y$:

  1. Perform cross-multiplication:

    $ 3 \times (0.20x + 0.70y) = 4 \times (0.80x + 0.30y) $

  2. Distribute the multipliers:

    $ 0.60x + 2.10y = 3.20x + 1.20y $

  3. Rearrange the terms to group $x$ terms and $y$ terms:

    $ 2.10y - 1.20y = 3.20x - 0.60x $

    $ 0.90y = 2.60x $

  4. Determine the ratio $x : y$:

    $ \frac{x}{y} = \frac{0.90}{2.60} $

    $ \frac{x}{y} = \frac{9}{26} $

The ratio in which the first blend and the second blend are mixed is 9 : 26.

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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.

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

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