George is 60. his daughter jessica is 3/5 of his age. his grandson luke is 4/15 of his age. how many years older than luke is jessica?

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

The anwser cause i do not understand just plez

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?