Question

On July 4, 2020, America turned 7.69 x 10^9

seconds old. On that day, how old was America
in years? (Assume 365 days in a year)

Answer 1

America's age = 243.85 years

Further explanation

When converting units, list and multiply all the units until you find the unit you want

Time unit conversion

1 year = 365 days

1 day = 24 hours

1 hour = 3600 s

7.69 x 10⁹ seconds to years :

`\tt =7.69* 10^9~s* (1`hour)/(3600~s)* (1~day)/(24~hours)* (1~years)/(365~days)\\\\=(7.69* 10^9)/(3600* 24* 365)\\\\=\boxed{\bold{243.85~years}}`