Answer:
3,000 footballs
Explanation:
a) We can find the number of footballs produced in June by multiplying the number of rugby balls produced in that month (2400) by the factory's approximate production ratio of footballs to rugby balls, which is 5 : 4, or 5/4 in fraction form.

b) The expected number of footballs that we calculated may not be completely accurate because the given production ratio of footballs to rugby balls is only approximate, not exact. It does not account for fluctuations in demand or issues that can occur during production, such as unavailable materials or malfunctioning machines.