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The sum of all integers between 34 and 80 which are divisible by 7 is:
588
1085
1148
630
588
Substitute the letter codes with their corresponding mathematical operators immediately, and solve strictly following the BODMAS rule.
Substitute the letter codes with their corresponding mathematical operators immediately, and solve strictly following the BODMAS rule.
Step 1: Note the given operator replacements
According to the question, A stands for division (/), B stands for multiplication (x), C stands for addition (+), and D stands for subtraction (-).
Step 2: Substitute the letters into the equation
Replacing C, D, A, and B in the expression '55 C 7 D 54 A 9 B 8' gives: 55 + 7 - 54 / 9 x 8.
Step 3: Apply the BODMAS rule (Division first)
First, evaluate the division part: 54 / 9 = 6. The expression becomes: 55 + 7 - 6 x 8.
Step 4: Perform Multiplication
Next, evaluate the multiplication part: 6 x 8 = 48. The expression becomes: 55 + 7 - 48.
Step 5: Perform Addition and Subtraction
First add 55 + 7 = 62, then subtract 48: 62 - 48 = 14.
B: 24 is incorrect as it results from calculation errors during multiplication or division order. C: 34 is incorrect and does not match the BODMAS evaluation. D: 41 is incorrect because it miscalculates intermediate operations.
A is correct because substituting the letters with their respective arithmetic operators and applying the BODMAS rule yields 14.
Always follow the strict BODMAS order (Bracket, Of, Division, Multiplication, Addition, Subtraction) after replacing symbols to avoid careless arithmetic errors.
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