DSQ: Understanding mixture problems
Practice Questions
GMAT Quantitative Reasoning › DSQ: Understanding mixture problems
A delivery truck is carrying two types of packages, green boxes and brown boxes. Green boxes weigh 10 lbs each, while brown boxes are 30 lbs each. At the weigh station, the driver notes that his load weighs exactly 400 lbs. How many green boxes does he have in his truck?
1. He is carrying exactly 20 boxes.
2. The driver never loads more brown boxes than green boxes.
Mark, the barista at Moose Jaw Coffee, has to mix together two kinds of coffee beans, Chocolate Explosion and Cherry Cherry Delight, to produce a blend that costs $12 per pound.
How much of each coffee goes into the mixture?
Statement 1: The Chocolate Explosion coffee costs $10 per pound.
Statement 2: The Cherry Cherry Delight coffee costs $16 per pound.
Two hydrochloric acid solutions, one of concentration 40% and one of concentration 25%, are mixed together to make a solution of 35% concentration.
How much solution is made?
-
200 ml of 40% solution is used
-
100 ml of 25% solution is used
What quantity of solution is obtained by diluting 
(1) The final solution contains 20% of acid.
(2) 
Carl, the barista at Moose Jaw Coffee, has to mix together two kinds of coffee beans - Vanilla Heaven, which costs $10 a pound, and Mountain Goodness, which costs $15 a pound - to produce a blend that costs $12 a pound.
How many pounds of Vanilla Heaven coffee beans go into the mixture?
Statement 1: The mixture will include 30 pounds of Mountain Goodness beans.
Statement 2: The finished blend will weigh 75 pounds.
How much water does a chemist need to dilute a pure solution of chlorine in order to obtain 150 ml of solution?
(1) The chemist would like the final solution to be 15% chlorine.
(2) There is no chlorine in water.
How much should a grocer sell a mixture of almonds and walnuts for?
(1) A pound of almonds is twice as expensive as a pound of walnuts.
(2) The mixture contains 0.7 pounds of walnuts and 0.3 pounds of almonds.
What is the price of a pound of almonds?
(1) A mixture of half almonds and half walnuts sells for $14 per pound.
(2) A pound of almonds is twice as expensive as the pound of walnuts.
A chemist dilutes 
(1) 
(2) 