A parking metre contains 78 coins made of nickels and dimes. The number of nickels exceeds the dimes by 4 how many of each are there

Question

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Answer 1

Hi 

Let N = number of nickels

D= Number of dimes 

N+D = 78

N = D + 4

So  D+4 +D = 78

2D = 78 - 4 

D = 74/2 = 37 

N= 78 -37 = 41

Answer 2

N + D = 78

N = D + 4

 

2D + 4 = 78

2D = 74

D = 37

N = 41