SOLUTION: How many litres of 15% weedkiller mixture must be added to 5 litres of 10% weedkiller mixture to make a 12% weedkiller mixture?

Question 1095527: How many litres of 15% weedkiller mixture must be added to 5 litres of 10% weedkiller
mixture to make a 12% weedkiller mixture?

Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
let x equal the number of liters of 15% weedkiller.

your equation is .15 * x + .10 * 5 = .12 * (x + 5)

simplify to get .15 * x + .10 * 5 = .12 * x + .12 * 5

simplify further to get .15 * x + .5 = .12 * x + .6

subtract .12 * x from both sides and subtract .5 from both sides and simplify to get .03 * x = .1

divide both sides by .03 to get x = .1 / .03 = 3.333333333 rounded to 9 decimal digits.

you would need 3.333333333 liters of 15% solution to be added to 5 liters of 10% solution to get 8.333333333 liters of 12% solution.

.15 * 3.333333333 = .5
.10 * 5 = .5

.5 + .5 = 1

5 + 3.333333333 = 8.333333333

1 divided by 8.333333333 = .12 which is equal to 12%.

solution looks good.

you would need 3 and 1/3 liters of 15% solution to be added to 5 liters of 10% to get 8 and 1/3 liters of 12% solution.

in decimal form rounded to 2 decimal digits, you would need 3.33 liters of 15% solution to be added to 5 liters of 10% solution to get 8.33 liters of 12% solution.

RELATED QUESTIONS
how many litres of 3% of mixture must be added to 24 litres of 6% mixture to make a 4%... (answered by josmiceli)

A MIXTURE OF 40 LITRES CONTAINS 10% WATER AND 90% MILK. HOW MANY LITRES OF WATER IS TO... (answered by lwsshak3)

A mixture of 50 litres of milk and water contain 10% of water. How much water must be... (answered by scott8148)

A mixture of 40 litres of milk and water contains 10% water.How muah water must be added... (answered by scott8148)

A tank contains 440 litres of a mixture which is 23.0% acid. How many litres of a mixture (answered by checkley77,nerdybill)

Two gasohol mixtures are available, one with 6.35% alcohol and the other with 11.28%... (answered by josmiceli)

How much water must be added to 30 litres of milk at 2 litres for $1.40 so as to have a... (answered by Theo)

how many litres of water must be added to a 100 litre container of orange juice that 20%... (answered by josmiceli)

Hi a paint mixture contains blue paint to white paint in the ratio 2:3.how many litres (answered by rothauserc)