Question

I, Sir Isaac Newton, was appointed to the Lucasian Chair of Mathematics at Cambridge University two years before 1/3 of my life had passed, Eighteen years later, two years after 1/2 of my life had passed, I published Principia. I become master of the Royal Mint in 1699 and held that position for the final 1/3 of my life.

When did I die and how old was I?

Answer 1

Year of death was 1727 at age 84

Explanation:

Let my current age was X

Newton was appointed chair when I was (1/ 3)X - 2 old

Eighteen years later

18 + (1/3) X - 2 = (1/2) X + 2

16 -2 = (1/2 -1/3)X

14 = (1/6) X

84= X

The age of death is 1699 + 1/3 X

1699 + (1/3) * 84

1699 + 28

1727