Answer:
John is 19 and his sister is 23.
Step-by-step explanation:
See attached image.
i think that it is the third one
-4 is what you put on both sides Bc it’s half of b
Answer:

Step-by-step explanation:
GIVEN: Tina, Sijil, Kia, vinayash Alisha and shifa are playing game by forming two teams Three players in each team.
TO FIND: how many different ways can they be put into two teams of three players.
SOLUTION:
Total number of players 
total teams to be formed 
total players in one team 
we have to number of ways of selecting
players for one team, rest
will go in other team.
Total number of ways of selecting
players 


Hence total number of different ways in which they can be put into two different teams is
Answer:
8.66214 x 10^11
Step-by-step explanation:
question may ask to round, so the answer may be simplified to 9 x 10^11