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If A means +, B means тАУ, C means ├Ч and D means ├╖, then what will come in place of the question mark (?) in the following equation? 21 A 18 D 2 B 3 C 5 = ?
14
15
17
16
15
Apply BODMAS strictly: solve Division, then Multiplication, then Addition/Subtraction in the order they appear to avoid calculation errors.
Apply BODMAS strictly: solve Division, then Multiplication, then Addition/Subtraction in the order they appear to avoid calculation errors.
Substitute the symbols
Given A=+, B=-, C=*, D=/. Replace the symbols in the expression 21 A 18 D 2 B 3 C 5: 21 + 18 / 2 - 3 * 5.
Apply BODMAS calculation
First, solve Division: 18 / 2 = 9. The expression becomes 21 + 9 - 3 * 5. Next, solve Multiplication: 3 * 5 = 15. The expression becomes 21 + 9 - 15.
Final addition and subtraction
Add: 21 + 9 = 30. Then, Subtract: 30 - 15 = 15.
A: 14 is incorrect because it fails to follow the division and multiplication sequence correctly. C: 17 is incorrect as it results from performing operations left-to-right without BODMAS priority. D: 16 is incorrect because the final subtraction 30-15 equals 15, not 16.
B is correct because following the BODMAS rule (Division 18/2=9, Multiplication 3*5=15, then Addition and Subtraction 21+9-15) yields exactly 15.
In mathematical operations questions, always check for division first as it often dictates the feasibility of the subsequent integers.
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