17. ralph is 3 times as old as sarah. in 4 years ralph will only be twice as old as sara will be then. find ralph’s age now.
1 answer:
You might be interested in
Answer:
Step-by-step explanation:
An urn contains two blue balls (denoted ) and three white balls (denoted
).
In the selection, a ball is picked and replaced.
From the attached probability tree, the possible outcomes are:
(a)If the first ball drawn is blue
Number of Outcomes =10
The probability that the first ball drawn is blue
(b)If only white balls are drawn
Number of Outcomes =9
Probability that only white balls are drawn
