Question

The temperature at 12 noon was 10°C above zero. If it decreases at the rate of 2°C per hour until midnight, at what time would the temperature be 8°C below zero? What would be the temperature at mid-night?
NCERT Class 7th Mathematics Chapter 1 Integers

Answer 1

temperature will be8°c below zero at 9:0pm and at midnight the temperature will be 14°c below zero.

Answer 2

Hola

here  is your ans....

at 12 noon temp = 10 ° c
Given decrease by 2 ° c


∴ 12 noon = 10°
1pm=10-2=8°

2pm=8-2=6°
3pm=4°
4pm=2°
5pm=0°
6pm=-2°

......
.....


.....

11pm=-12°
12midnight =-14


hence we say that at 9pm temp = below 0  => 8° c
and 12 midnight temp will be 14°c below zero


Hope it's help u