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Applying Algebra in Calendars

Write down a ...

Question

Write down a formula for the marks, M, obtained by a candidate who answered all the questions but had only x of them correct.

A

M = 3x -15

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B

M = 3x -25

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C

M = 2x -25

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D

M = 2x -15

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Solution

The correct option is B M = 3x -25
Let the number of correct questions be x.
So, the wrong answers will be 25 - x.

M = 2x +(-1)(25 - x)
M = 2x + (-25 + x)
M = 3x - 25.

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