If P means '+', Q means '−', R means '×' and S means '÷', then 36 S 4 R 3 P 15 Q 7 = ?
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Answer: Option B — 35
Detailed Solution
Decode: .
and .
.
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.⚠ Common trap
(A) 11 — works first, then and ; division and multiplication go left to right.Quick tip
Division and multiplication are worked left to right
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Ask a doubtMore Mathematical Operations Questions
View all ›- Q1.If means , means , means and means , then evaluate
- Q2.If 'E' stands for '+', 'F' stands for '-', 'M' stands for '×' and 'N' stands for '÷', then 19 M 5 E 39 N 3 F 8 = ?
- Q3.Correct the following equation by interchanging two signs:
- Q4.If '+' means '×', '−' means '÷', '×' means '−' and '÷' means '+', then what is the value of ?
- Q5.If 9 × 3 + 8 = 24, 10 × 2 + 7 = 35 and 80 × 40 + 3 = 6, then find the value of 12 × 4 + 3 = ?
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Mathematical Operations — Preparation
This question tests your understanding of Mathematical Operations, a key topic in the Logical Reasoning section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
Mathematical operations questions replace the usual arithmetic signs with different symbols and ask you to evaluate an expression using the new meanings. For example, if + means ÷, ÷ means -, - means x and x means +, you must rewrite the expression with the true signs before calculating. A second type defines a new operation, such as a * b = 2a + b, and asks you to apply it to given numbers. The most common mistake is calculating with the old meanings of the signs. Replace every symbol first, writing the new expression clearly, and only then apply BODMAS (Brackets, Orders, Division, Multiplication, Addition, Subtraction). For defined operations, substitute the numbers into the rule exactly as written, working from the inside out when operations are nested. Some questions also ask which signs must be interchanged to make an equation correct. In that case, test the most likely pairs of signs rather than trying every combination. Practise the mathematical operations questions below. Each solution shows the sign replacement and the calculation step by step.