There are 36 students in my classroom. if 5\12 in my class room are girls then how many girls are in my classroom

Do 12/14 and 8/10 have the same value? explain your answer.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

3x + 4y = 5 x- 3y = -7 solve by substitution