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The best way to tackle this sort of worded problem is to create a solvable equation. Lets call the bill before the voucher was used, X. So, the price after the voucher was applied is: = X...

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Let's first break down the concepts involved in this question. Price elasticity of demand is the responsiveness of the quantity of a good demanded to changes in the price of that good. Cross price elastic...

There are two solutions here which must be found. Both 2 red pens and 2 black pens being selected.
First the red pensIf the total number of pens is 11 and number of red pens is 3, the probability of ...

We should recall that two lines are parallel when they have the same gradient. We can see the gradient of a line by writing it in the form y=mx+c, which will make the gradient equal to the coefficient of ...