“It is wiser to find out than to suppose.”

###### — Mark Twain

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## Mixture Question

A farmer wants to mix milk containing 3% buttermilk with cream containing 30% butterfat to obtain 900 gallons of milk which is 8% butterfat. How much of each must he use? Comments

## Average Speed

Last weekend police ticketed 18 men whose mean speed was 72 miles per hour, and 30 women going an average of 64 mph. Overall, what was the mean speed of all the people ticketed? A) 69 mph B) 68 mph C) It cannot be determined. D) 67 mph E) none of those Comments

## Mean Speed

Last week, police ticketed 13 men traveling 18 miles per hour over the speed limit and 8 women traveling 14 miles per hour over the speed limit. What was the mean speed over the limit of all 21 drivers? A. 16 miles per hour B. 16.5 miles per hour C. 17 miles per hour D. […]

## Dilute a Solution

Marie has 25 ounces of a 20% boric acid solution which she wishes to dilute to a 10% solution. How much water does she have to add to obtain a 10% solution? Comments

## Increase Concentration

How much pure alcohol must a nurse add to 10 liters of 60% alcohol to strengthen it to a 90% solution? a) 25 liters b) 30 liters c) 40 liters d) 32 liters e) 60 liters Comments

## Mixing Ingrediants

A store wants to mix two grades of coffee. One sells for $.80 per pound and one sells for $1.20 per pound. He wants to sell the mixture for $1.10 per pound. If he has 25 pounds of the $.80 per pound coffee, how much of the $1.20 must he use. Comments