A section

A section of the boardwalk is made of 15 boards. Each board is 9 1/4 inches wide. The total width of the boardwalk is 144 inches. The spacing between each board is equal. What is the width of the spacing between the boards?

Correct result:

s =  0.375 inch

Solution:

a=9+1/4=374=9.25 inch t=144 inch n=15  s=(t−n⋅ a)/(n−1)=(144−15⋅ 9.25)/(15−1)=38=38 inch=0.375 inch

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