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If A means +, B means тИТ, C means ├Ч, D means ├╖, then what will come in place of the question mark (?) in the following equation? 21┬аD┬а3┬аB┬а4┬аC┬а5┬аA┬а22=?
10
8
9
7
9
Apply BODMAS rules strictly: solve Division, then Multiplication, then Addition/Subtraction to evaluate the sequence correctly.
Apply BODMAS rules strictly: solve Division, then Multiplication, then Addition/Subtraction to evaluate the sequence correctly.
Substitute Symbols with Operators
Replace letters with their given mathematical operations: A means +, B means -, C means x, and D means /. The equation 21 D 3 B 4 C 5 A 22 becomes: 21 / 3 - 4 * 5 + 22.
Apply BODMAS Rule
Solve the expression 21 / 3 - 4 * 5 + 22 step-by-step: First division: 21 / 3 = 7. Next multiplication: 4 * 5 = 20. The expression is now 7 - 20 + 22.
Perform Final Arithmetic
Combine the remaining terms: 7 - 20 = -13, then -13 + 22 = 9.
A: 10 is the result of incorrect calculation; B: 8 is the result of incorrect order of operations; D: 7 is the result of applying wrong priority to operators.
C is correct because the step-by-step evaluation of 21 / 3 - 4 * 5 + 22 following the BODMAS sequence results in 7 - 20 + 22 = 9.
Always perform Division and Multiplication first; many students make mistakes by solving from left to right without respecting operator precedence.
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