The following equation is incorrect. Which two signs should be interchanged to correct the equation?
15×2+10−8÷20=15
- A- and +
- B÷ and x
- C+ and ÷
- Dx and -
Solution & Step-by-step Explanation
Let's check Option C (+ and ÷):
Interchanging the signs + and ÷, the equation becomes:
15×2÷10−8+20=15
Applying the BODMAS rule:
Division: 2÷10=
10
2
=0.2
15×0.2−8+20=15
Multiplication: 15×0.2=3
3−8+20=15
Addition and Subtraction:
3+20−8=23−8=15
Since LHS=RHS=15, Option C correctly satisfies the equation.
Interchanging the signs + and ÷, the equation becomes:
15×2÷10−8+20=15
Applying the BODMAS rule:
Division: 2÷10=
10
2
=0.2
15×0.2−8+20=15
Multiplication: 15×0.2=3
3−8+20=15
Addition and Subtraction:
3+20−8=23−8=15
Since LHS=RHS=15, Option C correctly satisfies the equation.