Is 4/5 and 20/25 equivalent?

Use the x-intercept method to find all real solutions of the equation.x^3-10x^2+27x-18=0

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?