If the total price of the Ferrari is "X",
what luc paid whas 1/7 of the price (total cost), which is x*1/7 or x/7
what mark paid was 2/3 from the remaining. The remaining is x*6/7 (because x-x/7=6x/7) and he paid 2/3 of it so .. its x*2/3*6/7 = x*12/21 or 12x/21
and lolly paid 28000
When you sum up the three of them you get the total price, which is X.
x/7 + 12x/21 + 28000 = x
3x/21 + 12x/21 + 588000/21 = 21x/21
15x+588000=21x
21x-15x=588000
6x=588000
x=98000
So the price of the ferrari was sh98000