How many of a 25% acid solution must be added to 40 gallons of 40% acid solution to get a solution that is 30% acid?

Parking in a studen lot cost $3.00 for the first half hour and $1.50 each hour thereafter. a partial hour is charges[..]

the area of a triangle must be at most 32.5 square inches. the base is 13 inches and the height is x inches. find[..]

the area of a triangle must be at most 32.5 square innches. the base is 13 inches andthe hieght is x inches find the[..]

A company will need $45,000 in 8 years for a new addition. To meet this goal, the company deposits money in an[..]

When two gears are mashed, the revolutions per minute (rpm) are inversely proportional to the number of teeth, as[..]

A crew consist of 1 apprentice, 1 journeyman, and 1 master carpenter. The crew receives a check of $6800 for a job[..]

Two bike riders ride around a circular path. THe first rider completes one round in 10 minutes and the second rider[..]

A shopper buys three oranges and five lemons for $10.26, while a second shopper buys four lemons and six oranges for[..]

the sum of a number and the difference between the number and six” into a variable expression and then simplify.