Rates = ratios
Official Guide practice (find these in your Official Guide or at www.gmatclub.com)
Solve the problems below using the method of rates=ratios. Challenge yourself to solve them without using algebra. It’s possible!
PS02286 When traveling at a constant speed of 32 miles per hour
PS17479 During a certain time period, Car X
PS13101 Pumping alone at their respective constant rates, one inlet pipe fills
PS09737 Working simultaneously and independently at an identical constant rate
PS08865 Three printing presses, R, S, and T,
PS04617 After driving to a riverfront parking lot
DS00858 Machine R and machine S work
DS01257 A conveyor belt moves bottles
DS06315 On a certain nonstop trip, Marta averaged x miles
DS16164 At what speed was a train traveling
More Official Guide Practice
These problems can also be solved using the method of rates=ratios. However, they have some extra nuances. Notice that: unit conversions are basically rates; a unit contains the relevant formula (the unit “mph” means ‘number of miles’ divided by ‘number of hours’); and, when you see variables in answer choices, it’s possible to pick a convenient smart number to solve the problem.
PS02295 On a vacation, Rose exchanged
PS39811.02 Exchange Rates in a Particular Year
PS92820.02 A salesperson who had been driving at a speed of 100 kilometers per hour
PS07672 A doctor prescribed 18 cubic centimeters
PS49140.02 If the mass of 1 cubic centimeter of a certain substance is 7.3 grams
PS30720.02 A certain state’s milk production
PS08570 During a trip, Francine traveled x percent
PS00428 Working simultaneously at their respective constant rates, Machines A and B
DS08995 In planning for a car trip, Joan estimated