You are taking a road trip and your car gets 25 miles to the gallon. it has a gas tank which holds 14 gallons of gas. if this is the case, how many times will you have to fill up the tank if your trip distance is 250 miles?

(250 mi) x (1 gal / 25 mi) = 10 gal

10 gal < 14 gal tank
only have to fill up once.

Yeah, but what are you trying to ask?

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -