NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 1: Number System - Problems and Solutions
Question 112

Question. 112

112. Social Studies Application:

(a) The Greco–Roman era in Egypt started in 330 BC and ended in 395 AD. How long did it last?

(b) Bhaskaracharya was born in 1114 AD and died in 1185 AD. What was his age at death?

(c) Turks ruled Egypt in 1517 AD. Queen Nefertis ruled Egypt about 2900 years before the Turks. In which year did she rule?

(d) Greek mathematician Archimedes lived between 287 BC and 212 BC and Aristotle lived between 380 BC and 322 BC. Who lived during an earlier period?

Answer:

(a) 725 years

(b) 71 years

(c) 1383 BC

(d) Aristotle

Detailed Answer with Explanation:

(a) From 330 BC to 395 AD spans 330 years up to 1 BC + 395 years after 1 AD → 725 years.

(b) \(1185-1114=71\).

(c) \(1517-2900=-1383\Rightarrow 1383\,\text{BC}\).

(d) 380–322 BC is earlier than 287–212 BC.

NCERT Exemplar Solutions Class 7 – Mathematics – Unit 1: Number System – Problems and Solutions | Detailed Answers