Alvin is 5 years older than elgar. the sum of their ages is 103. what is elgar age

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?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Divide. write in the simplest form. 4 1/6 divided by 10