Practice30Create account

A borewell rig in Latur reaches 126 feet below ground in 6 days, going down the same distance each day. Taking depth below ground as negative, what integer represents one day's change in depth?

Class 7Integers (Extended)Integers
  • A−21
  • B21
  • C−20
  • D−132

Step-by-Step Solution

The total change is −126 feet spread over 6 equal days, so each day contributes (−126) ÷ 6 = −21 feet. Answering 21 loses the sign, and a rig that goes down cannot have a positive change; −132 subtracts the 6 instead of dividing by it.
Answer: A) −21

Key idea: Dividing integers

The sign rule for division is **the same as for multiplication**: same signs → positive, different signs → negative.

12 ÷ 4 = 3
(−12) ÷ (−4) = 3
12 ÷ (−4) = −3
(−12) ÷ 4 = −3

Also: integer ÷ 1 = the integer; integer ÷ itself = 1; **never divide by 0** — division by zero is undefined.

Master this chapter in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Integers (Extended) practice questions

More Class 7 Integers (Extended) practice

A driver in Hyderabad begins the year with 12 licence points. Each traffic violation…In a Bengaluru mall the basement levels are numbered −1, −2 and −3, the ground floor is…In a survey of the Chilika lagoon, point A is recorded at −7 m and point B at −11 m,…A cold-storage unit for Nashik grapes reads 4°C, and its compressor lowers the reading…Two kirana shops close the week with these entries, money paid out being negative. Shop…