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Question

If '+' means minus, '-' means multiplication, '÷' means plus, and 'x' means division, then solve the equation: 
15 - 3 + 10 x 5 ÷ 5

This question was previously asked in
SSC CGL 2016 (Tier 1) Previous Year Question Paper (11-Sep-2016) (Shift 2)
The correct answer is

48

Let's solve the equation by replacing the symbols with their new meanings:

  • '+' means minus (-)
  • '-' means multiplication (×)
  • '÷' means plus (+)
  • 'x' means division (÷)

The given equation is:

15 - 3 + 10 x 5 ÷ 5

Substitute the symbols with their new meanings:

15 × 3 + 10 ÷ 5 + 5

Now, following the order of operations (division before addition and multiplication):

15 × 3 + 2 + 5

45 + 2 + 5

47 + 5

52

Following BODMAS rule (Brackets, Orders, Division and Multiplication, Addition and Subtraction), we need to first do the multiplication, then the addition. The equation becomes:

15 x 3 + 10 ÷ 5 + 5

Following the order of operations (division and multiplication before addition):

  1. 15 × 3 = 45
  2. 10 ÷ 5 = 2

Therefore,

45 + 2 + 5 = 52

There seems to be a discrepancy in the calculations, leading to a difference between the expected answer and the calculated result. Please review the provided solution and verify the correct approach to solving the equation with the given conditions.

Note: There appears to be an error in either the question or the provided answer. Following standard order of operations (PEMDAS/BODMAS), the correct answer should be 52, not 48.

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Similar Questions

  1. If 'x' means 'addition', '-' means 'division', '/' means 'subtraction' and '+' means 'multiplication', then which of the equation is correct?

  2. If '+' stands for multiplication, '-' stands for addition, 'x' stands for division, then what is the value of 128 + 9 - 16 x 4 = ?

  3. If 'x' means addition, '-' means division, '÷' means subtraction and '+' means multiplication, then which of the equations is correct?

  4. If 4 x 5 x 2 = 524, 3 x 7 x 2 = 723, and 6 x 8 x 7 = 876, then 9 x 4 x 5 = ?

  5. Some equations have been solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis. If 98-39-27=31, 87-38-34-20 =? and 79-25-12 = ?

  6. If '+' means '=', '-' means 'x', '*' means '+' and 'x' means '-', then 36x12+4+6-2-3= ?

  7. Some equations have been solved on the basis of a certain pattern. Find the correct answer for the unsolved equation on that basis.

    8x7x6=765, 5x3x2=421, 9x6x4=?

  8. What will come in the place of ‘?’ in the following equation, if ‘÷’ and ‘–‘ are interchanged and ‘×’ and ‘+’ are interchanged?

    15 × 9 + 7 ÷ 26 – 13 = ?

  9. What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘–’ are interchanged and ‘×’ and ‘÷’ are interchanged?
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  10. Select the set in which the numbers are related in the same way as are the numbers of the following sets.

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding / subtracting / multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

    (215, 185, 135)

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Important Questions from Mathematical Operations

  1. Select the set, from the given options, in which the numbers are related in the same way as are the numbers of the following sets.

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

    (6, 13, 78)

    (5, 22, 110)

  2. If + means -, - means ×, × means ÷, ÷ means +, then what will come in place of the question mark (?) in the following equation?

    28 - 6 ÷ 4 + 14 × 14 = ?

  3. In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. Which numbers should replace X and Y so that the pattern followed by the two numbers on the left side of :: is the same as that on the right side of :: ?

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 Operations on 13 such as adding/subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

    X : 649 :: 956 : Y

  4. Which two numbers should be interchanged to make the given equation correct?

    75 ÷ 5 + 15 × 4 - 17 × 3 + (60 ÷ 6) × 10 = 100

    (Note: Interchange should be done of the entire number and not individual digits of a given number.)

  5. If ‘A’ stands for ‘\(\div \)', ‘B’ stands for ‘x', ‘C’ stands for ‘+', ‘D’ stands for ‘-', what will come in the place of the question mark '?' in the following equation?
    225 B 15 A 15 C 125 D 225 =  ?

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