That is correct , there is only one single shock spring in the last row as the one above are in 2 x pairs, so these pairs are counted as 2 each pairs, where as the one in the last row is not a pair, just a single one so counts as 1But there is only one spark plug?? Not two, so the value is 1
+ 5 = 15
...and that is why they bet that 99.9% will failLol! after all that it must have been a sort of trick question...you are very observant which I guess that is what it is all about.