How many gallons of gasoline that is 8% ethanol must be added to 2,000 gallons of gasoline with no ethanol to get a mixture that is 6% ethanol?

How many gallons of gasoline that is 8% ethanol must be added to 2,000 gallons of gasoline with no ethanol to get a mixture that is 6% ethanol?

The dimension of a rectangular plot is (7p+4q) and (2q+8p) units respectively.Find the area of the plot when p=2 and q=1.

How much money should you invest now at an annual interest rate of 2.5% compounded monthly if you want $45,000, 20 years in the future? We have to use the formula F=P(1+i)^n...

a. bn = 2n + 3 b. dn = (-1)n • n2

Two small pitchers and one large pitcher can hold 8 cups of water. One large pitcher minus one small pitcher constitutes 2 cups of water. How many cups of water can each pitcher hold? ...

This is a Math Olympiad question for high grades and i am only 6th grade.

Two planes leave simultaneously from Chicago's O'Hare Airport, one flying north and the other east. The northbound plane is flying 50 miles per hour faster than the eastbound plane. After 3 hours,...

A rectangular classroom seats 252 students. When the seats are rearranged with three more seats in each row, the classroom has two fewer rows. Find the original amount of seats in each row.

You've invested a total of $30,000 at 3% and 4 1/2% simple interest. During one year, the two acco earned $1200. How much did you invest in each account?

A. Calculate the perimeter of the polygon whose vertices are the complex fourth roots of 1. B. Calculate the perimeter of the polygon whose vertices are the complex ninth roots of 1....

A cone has volume V=⅓πr2h, where r is the radius of the cone's base and h is the height of the cone. Find the height in centimeters of a cone with volume 96πcm3 and radius 6 centimeters. Note π...

A trail mix comprised of 59% raisins is being mixed with a trail mix variety that is 41% raisins to create a 72 lb. bag of trail mix that is 50% raisins. How many pounds of the 59% raisins...

Locate a sale television. Choose one television that is on sale. Note the original price and the discount as a percent. Find the saving in dollars and cents on the purchased of this television.

The owners of a marina bought 6 canoes to be used as rentals at a cost of $650 per canoe. They borrowed 80% of the total cost for 8 months at 7 1/2% interest. Find the amount due using simple interest...

Please find roots of 9 x squared minus 155 x minus 500 is equal to zero

I am a 7th grader who is studying for a academic pentathlon competition that is on march.

Write and solve a system of equations for the following situation.

Convert 25 miles per hour to feet per second. (1 mile = 5280 feet and 1 hour = 3600 seconds)

Write as an equation: The sides of a rectangle are x and (x−4). The perimeter is 87.

The total cost of gasoline varies directly with the number of gallons purchased. Kathy pays $17.93 for 11 gallons of gasoline. Which equation shows the relationship between the total cost of gasoline,...