Which two signs should be interchanged to make the given equation correct?
551÷19−16×12+121=100
- A+ and ×
- B÷ and ×
- C+ and −
- D− and ×
Solution & Step-by-step Explanation
Let us test the options to see which interchange balances the equation.
Let's test Option C (+ and −):
The equation becomes:
551÷19+16×12−121=100
Following BODMAS rules:
Division:
551÷19=29
Multiplication:
16×12=192
Addition and Subtraction:
29+192−121=221−121=100
Since 100=100, interchanging + and − correctly balances the mathematical statement.
Let's test Option C (+ and −):
The equation becomes:
551÷19+16×12−121=100
Following BODMAS rules:
Division:
551÷19=29
Multiplication:
16×12=192
Addition and Subtraction:
29+192−121=221−121=100
Since 100=100, interchanging + and − correctly balances the mathematical statement.