Amerchant has coffee worth $20 a pound that she wishes to mix with 40 pounds coffee worth $40 a pound to get a mixture that can be sol for $30 a piund. how many pounds of the $20 coffee should be used?

Apark is in the shape of a rectangle. the park authorities are planning to build a 2-meter-wide jogging path in the park (shown as the shaded region in the image). what is the area of the jogging path? plz

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

If you can solve all of these i will give ! - 4% of 190 - 4% of 162.5 - 4% of 140 - a 4% increase from 155.1 - a 4% increase from 159.8