Aashalata Badami Solutions for Chapter: Time, Exercise 10: Worksheet

Thomas Alva Edison was born in $1847$. He invented the electric bulb. How old he was when he invented the electric bulb at $1879$?

If this is the year $2004$, and if the first aeroplane was built in $1903$ what is the difference between the years? 

Fountain pen was invented in $1884$. The ballpoint pen was invented $54$ years after the fountain pen. When was that$?$

The cycle was invented $49$ years before the petrol car which was invented in $1888$. When was the bicycle invented$?$ 

If this is the year $2004$. How many years ago was the refrigerator invented if the refrigerator was first invented in $1850$$?$

Alexander Graham Bell invented the telephone in $1876$. How many years ago was that, if this is the year $2004$.