Lindsey has 47 coins in her change purse that are either dimes or quarters. If n represents the number of quarters she has,write an expression in terms of n that describes the number of dimes

Answer 1

We let the unknowns using variables:
Let n = number of quarters
Let k = number of dimes
Note that the sum or total of quarters and dimes is 47. Therefore, we can say that
n + k = 47
Since we need to find the number of dimes (which is k) in terms of umber of quarters (that is n), from the above equation,
k = 47 - n

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