Vitamin doses

Children and adults take the recommended doses of vitamins daily throughout the year. According to the package insert, the recommended daily dose of vitamins for a child is half that of an adult. Two adults together consume one package of vitamins in 30 days.
The question is: How many days will it take for two adults and one child to consume one pack of vitamins?

Correct answer:

t =  24

Step-by-step explanation:

x=2 30=60 y=2 x=2 60=120  t (2/x+1/y)=1  t=2/x+1/y1=2/60+1/1201=24



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