Pretone anti-freeze has 18% alcohol in it. Pleak anti-freeze has 10% alcohol in it. How many liters of each should be mixed to get 20 liters of a mixture that is 15% alcohol?

I’m stuck on this i don’t understand.

Design a number line containing five (5) points2.benin, one of the smallest countries in africa, has a total area of 43,475 square miles. the population of the country was recently estimated at 10,160,555. about 3,657,790 people live in rural areas. the country has only about 870 miles of surfaced roads. a. round off the total population to the nearest hundred thousand people. b. round off benin’s area in square miles to the nearest thousand. c. round off the number of miles of surfaced roads to the nearest ten. d. round off the number of people who live in rural areas to the nearest million.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)