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If 'A' means '+', 'B' means '-', 'C' means '×', 'D' means '÷', then 10 C 5 A 20 D 4 = ?
55
60
50
45
55
Substitute the symbols first and strictly apply the BODMAS rule (Division and Multiplication before Addition) to solve instantly.
Substitute the symbols first and strictly apply the BODMAS rule (Division and Multiplication before Addition) to solve instantly.
Symbol Substitution
Replace the letters with their respective mathematical operators: 'C' becomes multiplication, 'A' becomes addition, and 'D' becomes division. The expression 10 C 5 A 20 D 4 transforms into 10 × 5 + 20 ÷ 4.
Applying BODMAS
First, solve the division part: 20 ÷ 4 = 5. Next, solve the multiplication part: 10 × 5 = 50. Finally, add the results together: 50 + 5 = 55.
B: 60 is incorrect due to incorrect order of operations. C: 50 is incorrect as it leaves out the division component. D: 45 is incorrect because of an arithmetic calculation error.
A is correct because substituting the operations and applying BODMAS to 10 × 5 + 20 ÷ 4 results in 50 + 5 = 55.
Always execute division and multiplication before addition and subtraction in mixed operation problems to avoid common arithmetic pitfalls.
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