Explanation

Let's calculate the day 43 days after Saturday, 24 June.

43 days equals 6 weeks and 1 day, meaning we land back on a Saturday after 42 days, and 1 more day takes us to Sunday.

Adding 43 days to 24 June takes us to 6 August.

So, 43 days after Saturday, 24 June is Sunday, 6 August.