Algebra-1

We are given the exchange rate is $3 to 4 Francs. This means for every $3 exchanged, you get 4 Francs.
To determine how many Francs for $240, we set up a ratio. The ratio is 4 Francs : $3.
To find how many Francs for $240, we take $240 and divide by $3 since that is the exchange portion of the ratio. <...