Anthony H. answered • 09/27/14

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Maintaining the same unit of currency, on the surface, the answer might appear to be 10 francs. That response would make the snow globe only 90 francs more expensive. Conversion to the euro - the currency of choice among Parisians and member nations - will lead us to a different response.

However, a little more analysis will steer us to a different conclusion - 5 francs - and can be shown algebraically as:

Solve for

*x*:postcard,

*x*snow globe,

*x+100*110 = x + (x+100)

= x + x + 100

= 2x + 100

10 = 2x

x = 5

We can check our answer by substituting the variable with our solution. Through substitution, it can be shown that the snow globe, x+100, is 100 more than the postcard (5+100), or 105 francs. That supports the conclusion of a postcard valued at 5 francs. Solving for x makes provision for a more controlled, logical response to an otherwise elementary query.

A little overkill, perhaps.

Anthony H.

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Thanks for sharing!

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09/27/14

Judy H.

09/27/14