Question

Exercise 1.6
1. A submarine was situated 600 feet
below sea level. If it ascends 250 feet,
what is its new position?
2. The temperature of a particular place
at noon on a winter day was 5°C. At
midnight, the temperature had dropped
by 12°C. What was the temperature at
midnight?
3. The sum of two integers is --250. If one
integer is 120, find the other.
4. In a competitive examination, (+4)
marks are given for every correct
answer, (-2) marks are given for every
incorrect answer and 0 marks for not
attempting the question.
a) Ruchi scored 20 marks. If she
has got 12 correct answers, how
many questions has she attempted
incorrectly?
b) Rohit scored (-6) marks in this
test, though he has got 7 correct
answers. How many questions has
he attempted incorrectly?
5. Anil deposited 5,000 in his bank
account on one day and withdrew
2,400 on the second day. On the
third day, he again deposited 1,800.
What was his balance at the end of the
third day?
6. The product of two negative integers
is 420. If one integer is (-5), find the
other.
7. An elevator descends into a mine shaft
at the rate of 6 m/min. If it begins
to descend from 20 m above the
ground, what will be its position after
45 minutes?​

Answer 1

Answer:

1.) 350 feet

2.) -7 °C

3.) -370

4.) 9

a = 17

b = 9

5.) 4400

6.) -84

7.) -232