A hydrocarbon mixture consists of 60.0 % by mass of C3H8 and 40.0 % of CxHy. When 10.0 g of this mixture is burned, 29.0 g CO2 and 18.8 g H2O are the only products. What is the formula of the unknown hydrocarbon?

answer; economic order quantity;

c)red bank

explanation:

red bank is a borough in monmouth county, new jersey, incorporated in 1908 and located on the navesink river, the area's original transportation route to the ocean and other ports.

i do not get it   at all