Assume the number 100. 100*1.09=109. You then do 109*0.86=93.74.
So the overall decrease is 6.26%.
X represents the amount of weeks:
7+x for Germany and 3+2x for Tony they have to be equal for them to run the same distance:
3+2x=7+x
-3 from each side:
2x=4+x
-x from each side:
x=4
They run the same distance on the fourth week, that distance is 7+4=11
Hope this helps :)
There are three terms. :)
5 and -5
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