Answer:
Percentage of the senior team's players = 70%
Step-by-step explanation:
Given : A high school football team has 60 players. 42 of the players are seniors.
We have to find the percentage of the team's players are seniors.
Since, 42 of the players are seniors out of 60 players.
Number of senior players = 42
total number of players = 60

Substitute, we have,

On simplify we have,
Percentage of the senior team's players = 70%