To find out what percentage of children chose football, we can start by calculating the total percentage of children who chose basketball and hockey and then subtract that from 100% to find the percentage who chose football.
Percentage who chose basketball = 35%
Percentage who chose hockey = 1/4 = 25% (since 1/4 is equivalent to 25%)
Total percentage who chose basketball and hockey = 35% + 25% = 60%
Now, to find the percentage who chose football:
Percentage who chose football = 100% - Total percentage who chose basketball and hockey
Percentage who chose football = 100% - 60% = 40%
So, 40% of the children chose football as their favorite sport.