If '-' means '+', '+' means '-', '*' means '÷' and '÷' means '*' then which of the following will be the correct equation?
Correct answer: D. 30 * 5 - 4 ÷ 10 + 15 = 31
- A. 10 + 5 - 14 ÷ 10 * 15 = 158
- B. 30 + 5 + 14 - 10 * 15 = 122
- C. 30 - 5 + 14 ÷ 10 * 15 = 162
- D. 30 * 5 - 4 ÷ 10 + 15 = 31
- E. None of these
Explanation
Your equation is:10 + 5 - 14 ÷ 10 * 15 = 158First, replace the symbols:+ → -- → +÷ → ** → ÷Thus, the equation becomes:10 - 5 + 14 * 10 ÷ 15Now, solve step-by-step following BODMAS:Multiplication and Division first:14 * 10 = 140140 ÷ 15 ≈ 9.333...Now the equation becomes:10 - 5 + 9.333...Left to right (Addition/Subtraction):10 - 5 = 55 + 9.333... = 14.333...Thus:Final result: 14.333..
This question appeared on the NUMS 2015 paper, which you can sit online with every answer explained.
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