Johnny bought 10 cupcakes for 12 dollars, how much would 15 cost?

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?

What is 20+(5 x 2/5 )+ 3 show your work

What is this inequality notation? t is less then or equal to 2