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Question

2 chairs and 1 table cost ₹880, while 1 chair and 2 tables cost ₹980. Find the cost of each.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
₹260 and ₹360

Algebraic Solution for Chair and Table Costs

Let C be the cost of one chair and T be the cost of one table.

From the problem statement, we can set up two linear equations:

  • Equation 1: $2C + 1T = 880$
  • Equation 2: $1C + 2T = 980$

Solving the System of Equations

We can solve this system using the elimination method.

  1. Multiply Equation 1 by 2 to make the coefficients of T match: $2 \times (2C + T) = 2 \times 880$ $4C + 2T = 1760$ (Equation 3)
  2. Subtract Equation 2 from Equation 3: $(4C + 2T) - (C + 2T) = 1760 - 980$ $3C = 780$
  3. Solve for C: $C = \frac{780}{3}$ $C = 260$
  4. Substitute the value of C back into Equation 1: $2(260) + T = 880$ $520 + T = 880$
  5. Solve for T: $T = 880 - 520$ $T = 360$

Therefore, the cost of one chair is ₹260 and the cost of one table is ₹360.

Verification

Check the costs using the second condition (1 chair and 2 tables cost ₹980):

$1C + 2T = 1(260) + 2(360) = 260 + 720 = 980$

The costs satisfy both conditions.

The cost of each chair is ₹260 and the cost of each table is ₹360.

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