By interchanging the given two signs which of the following equation will NOT be correct?
$+$ and $\div$
I. $27 \div 3 - 18 \times 3 + 9 = 24$
II. $12 \div 8 \times 12 + 16 - 7 = 19$
Interchanging Signs: Equation Analysis
The question asks us to swap the mathematical signs '+' and '÷' in the given equations (I and II) and determine which equation becomes incorrect after the swap. We will use the standard order of operations (BODMAS/PEMDAS) to evaluate the equations.
Equation I Analysis
Original Equation I: $27 \div 3 - 18 \times 3 + 9 = 24$
Interchange '+' and '÷':
- The equation becomes: $27 + 3 - 18 \times 3 \div 9$
- Applying BODMAS/PEMDAS:
- Multiplication first: $18 \times 3 = 54$
- Division next: $54 \div 9 = 6$
- The expression simplifies to: $27 + 3 - 6$
- Addition: $27 + 3 = 30$
- Subtraction: $30 - 6 = 24$
The resulting value is $24$, which matches the right-hand side of the original equation. Therefore, Equation I is correct after interchanging the signs.
Equation II Analysis
Original Equation II: $12 \div 8 \times 12 + 16 - 7 = 19$
Interchange '+' and '÷':
- The equation becomes: $12 + 8 \times 12 \div 16 - 7$
- Applying BODMAS/PEMDAS:
- Multiplication first: $8 \times 12 = 96$
- Division next: $96 \div 16 = 6$
- The expression simplifies to: $12 + 6 - 7$
- Addition: $12 + 6 = 18$
- Subtraction: $18 - 7 = 11$
The resulting value is $11$. The original right-hand side was $19$. Since $11 \neq 19$, Equation II is NOT correct after interchanging the signs.
Conclusion
Based on the analysis, only Equation II becomes incorrect when the signs '+' and '÷' are interchanged.
Similar Questions
- Which two signs should be interchanged to make the following equation CORRECT?
$[(15 \div 3) - (4 \times 2)] + [4 - 6] = 5 \times 10$ - If "+" means "$\div$", "-" means "+", "$\times$" means "-" and "$\div$" means "$\times$", which of the following options is CORRECT?
- If 5 @ 2 = 17 and 6 @ 3 = 27, what is 7 @ 4?
- If 9 @ 1 = 82 and 6 @ 2 = 38, what is the value of 7 @ 3?
- You are given a mathematical expression with basic operations. However, the symbols used are not their usual meaning.
You must follow these symbol substitution rules:
'+' means '-'
'-' means 'x'
'x' means '÷'
'÷' means '+'
$120 \div 6 \times 3 - 10 + 4 = ?$ - If $\times$ stands for addition, $\div$ stands for subtraction, + stands for multiplication, and - stands for division, then $12 \times 6 \div 3 - 2 + 5 = ?$
- Which two signs need to be interchanged?
$22 - 4 \times 2 \div 2 + 6 = 20$ - Which interchanges of numbers and signs will make the equation correct? $8 \times 3 + 4 = 28$
- Select the CORRECT sequence of mathematical signs to sequentially replace the A and B to balance the given equation.
15 A 5 B 4 = 35 - The following equation is incorrect. Which two signs should be interchanged to correct the equation?
$14 - 7 \times 30 \div 10 + 4 = 54$
Important Questions from Mathematical Operations
What will come in the place of ‘?’ in the following equation if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?
18 ÷ 9 + 24 × 3 − 16 = ?If ‘A’ stands for ‘÷’, ‘B’ stands for ‘×’, ‘C’ stands for ‘+’, and ‘D’ stands for ‘−’, what will come in place of the question mark (?) in the following equation?
88 B 3 D 12 A 4 C 6 = ?Select the set in which the numbers are related in the same way as are the numbers of the given sets.
(NOTE: Operations should be performed on whole numbers without breaking down the numbers into their 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.)
Given sets:
(9, 21, 193)
(12, 15, 184)What will come in the place of the question mark (?) in the following equation, if ‘÷’ and ‘+’ are interchanged and ‘−’ and ‘×’ are interchanged?
44 ÷ 78 + 6 − 3 × 19 = ?Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets?
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
