Explanation:
ignoring "disturbances" like leap years (366 days) we can simply assume that 1 year has 365 days.
1 day has 24 hours.
and 1 hour has 60 minutes.
so, one year has
60×24×365 = 525,600 minutes.
which is
5.256×10⁵
the given number of minutes is
8.35×10⁶
which is (the power of 10 - if positive - tells us how many positions to move the decimal point to the right, and to the left is negative).
8.35×10⁶ = 8,350,000
how many years are these ?
8,350,000 / 525,600 = 8.35×10⁶ / 5.256×10⁵ =
= 8.35/5.256 × 10⁶/10⁵ = 8.35/5.256 × 10¹ =
= 83.5/5.256 = 15.88660578... years