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Question

The average price of three items of furniture is ₹16,005. If their prices are in the ratio 3 : 5 : 7, the price of the cheapest item (in ₹) is:

This question was previously asked in
RRB NTPC 2024 CBT 1 Question Paper (28-Aug-2025) (Shift 3)
The correct answer is
9,603

Furniture Price Ratio Calculation

The problem asks for the price of the cheapest furniture item given the average price of three items and the ratio of their prices.

Calculating Total Price

First, find the total price of the three furniture items.

  • Average Price = ₹16,005
  • Number of Items = 3
  • Total Price = Average Price × Number of Items
  • Total Price = $16,005 \times 3 = ₹48,015$

Using Price Ratio

The prices are in the ratio 3 : 5 : 7. Let the prices be $3x$, $5x$, and $7x$, where $x$ is a common multiplier.

  • The sum of the ratio parts is $3 + 5 + 7 = 15$.
  • The sum of the actual prices is $3x + 5x + 7x = 15x$.

Solving for the Multiplier

Equate the sum of the actual prices to the total price calculated earlier.

  • $15x = ₹48,015$
  • $x = \frac{₹48,015}{15}$
  • $x = ₹3,201$

Finding the Cheapest Price

The cheapest item corresponds to the smallest part of the ratio, which is 3.

  • Price of Cheapest Item = $3x$
  • Price of Cheapest Item = $3 \times ₹3,201$
  • Price of Cheapest Item = ₹9,603

Therefore, the price of the cheapest item is ₹9,603.

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Important Questions from Average

  1. The average of 28 numbers is 77. The average of first 14 numbers is 74 and the average of last 15 numbers is 84. If the 14 th number is excluded, then what is the average of remaining numbers? (correct to one decimal places)

  2. 24 students collected money for donation. The average contribution was Rs. 50. Later on, their teacher also contributed some money. Now the average contribution is Rs. 56. The teacher’s contribution is:

  3. Out of 6 numbers, the sum of the first 5 numbers is 7 times the 6 th number. If their average is 136, then the 6 th number is:

  4. The average of five numbers is 30. If one number is excluded, then average becomes 31. What is the excluded number?

  5. The average weight of 49 students in a class is 39 kg. Seven of them whose average weight is 40 kg leave the class and other seven students whose average weight is 54 kg join the class. What is the new average weight (in kg) of the class?

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