In a class there are 12 girls and 18 boys. What is the ratio of girls to students in simplest form?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.