Ahusband and wife can complete a certain task in 1 and 2 hours respectively. their children, rae and herman, can complete the same task in 4 and 6 hours, respectively. what is the ratio of the couple's time working together to complete the task to the children's time working together to complete the task? a)15: 46b)3: 10c)12: 23d)5: 18e)10: 3

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?