I 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 lifetime had passed, I published
Principia. I became 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?Solution:
x=number of years in life (1/3)x-2+18=2+(1/2)x (1/3)x+16=2+(1/2)x 2x+96=12+3x 96=12+x 84=x x=84 years old 84/3=28 1699+28=1727 (year of death) |