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Evaluate: 15 ├Ч 4 - 20 ├╖ 2
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Perform division and multiplication simultaneously from left to right before doing subtraction to save exam time.
Expression to evaluate: 15 ├Ч 4 - 20 ├╖ 2
BODMAS:┬аDivisionтЖТMultiplicationтЖТAdditionтЖТSubtraction
Perform division and multiplication simultaneously from left to right before doing subtraction to save exam time.
Performing operations strictly from left to right without respecting the BODMAS/PEMDAS order of precedence, such as calculating 15 ├Ч 4 first and then incorrectly continuing, or subtracting before dividing.
Identify Order of Operations
According to the BODMAS rule, division and multiplication must be performed before subtraction. The given expression contains multiplication, subtraction, and division: 15├Ч4тИТ20├╖2.
BODMAS┬аRule
Perform Division
First, evaluate the division part of the expression: 20├╖2=10.
20├╖2=10
Perform Multiplication
Next, evaluate the multiplication part of the expression: 15├Ч4=60.
15├Ч4=60
Perform Subtraction
Substitute the results back into the expression: 60тИТ10=50.
60тИТ10=50
A is correct because evaluating the expression using the BODMAS rule yields 50.
Mastering the BODMAS rule is essential for simplifying complex algebraic expressions and solving data interpretation calculations accurately in railway and competitive exams.
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