The number of nine-players team= 21 teams.
The number of ten-players team= 5 teams.
Explanation:
step 1: The total players signed up for a volleyball league= 118 boys+121 girls= 239 players.
step 2: The coach first makes a 9 players team= 239-9= 230 members
In this stage, the number of 9 players-team is one.
step 3: The remaining 230 players cannot be divided equally into 9 players, since 230 is not divisible by 9.
step 4: Find the number within 230 that is divisible by 9 as a whole. Check for easy number (9*20= 180 is within 230)
Therefore, 230-180= 50 players are remaining.
In this stage, the number of 9 players-team= 1+20= 21 teams with 9-players.
The number of 10 players-team= 50 players/10= 5 teams with 10-players.