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The cost of one pencil, two pens and four erasers is Rs.22 while the cost of five pencils, four pens and two erasers is Rs.32.How much will three pencils, three pens and three erasers cost?
    Correct answer is '27'. Can you explain this answer?
    Verified Answer
    The cost of one pencil, two pens and four erasers is Rs.22 while the c...
    let the cost of 1 pencil, 1 pen and 1 eraser are respectively x, y, z. Then according to the given condition
    1x + 2y + 4z = 22
    5x + 4y + 2z = 32
    on adding these two equations we get 6x + 6y + 6z = 54 
    or 3x + 3y + 3z = 27
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    Most Upvoted Answer
    The cost of one pencil, two pens and four erasers is Rs.22 while the c...
    Given Information:

    Cost of 1 pencil + 2 pens + 4 erasers = Rs. 22

    Cost of 5 pencils + 4 pens + 2 erasers = Rs. 32


    Let's solve the problem step by step:


    Finding the cost of individual items:

    Let's assume the cost of 1 pencil is 'x' Rs.

    Similarly, let's assume the cost of 1 pen is 'y' Rs.

    And let's assume the cost of 1 eraser is 'z' Rs.


    Forming the equations:

    According to the given information, we can form the following equations:

    x + 2y + 4z = 22 ---- Equation 1

    5x + 4y + 2z = 32 ---- Equation 2


    Solving the equations:

    We can solve these equations using the method of substitution or elimination.

    Multiplying Equation 1 by 2 and Equation 2 by 4 to eliminate 'z', we get:

    2x + 4y + 8z = 44 ---- Equation 3

    20x + 16y + 8z = 128 ---- Equation 4


    Subtracting Equation 3 from Equation 4, we get:

    18x + 12y = 84

    Dividing both sides by 6, we get:

    3x + 2y = 14 ---- Equation 5


    Multiplying Equation 2 by 2 and subtracting Equation 1 from it, we get:

    8x + 8y - 2x - 4y - 8z = 64 - 22

    6x + 4y - 8z = 42 ---- Equation 6


    Adding Equation 5 and Equation 6, we get:

    9x + 6y = 56

    Dividing both sides by 3, we get:

    3x + 2y = 18 ---- Equation 7


    Calculating the cost of individual items:

    Solving Equation 5 and Equation 7 simultaneously, we get:

    3x + 2y = 14

    3x + 2y = 18


    Subtracting Equation 7 from Equation 5, we get:

    0 = 4


    This means the equations are inconsistent. There is no unique solution to the system of equations.


    Calculating the cost of three pencils, three pens, and three erasers:

    Since we couldn't find the cost of individual items, we cannot accurately calculate the cost of three pencils, three pens, and three erasers.

    Therefore, the given answer of '27' is not correct.
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    The cost of one pencil, two pens and four erasers is Rs.22 while the cost of five pencils, four pens and two erasers is Rs.32.How much will three pencils, three pens and three erasers cost?Correct answer is '27'. Can you explain this answer?
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