For explaining purposes :
Lets say you only wanted to calculate the path of 3 benches, the result would then be :
1.5 + 4.5 + 1.5 + 4.5 + 1.5 = 13.5
I could also write this as
3*(1.5) + 2*(4.5) = 13.5
Turning this into a formula :
x*(1.5) + (x-1)*(4.5) = y
So for 17 benches :
17 * 1.5 + 16 * 4.5 = 97
a) the length would be 97 m
for b)
x*(1.5) + (x-1)*(4.5) = 163.5
Using this website's awesome automatic solver :
| Solved by pluggable solver: EXPLAIN simplification of an expression | |
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