Advertisements
Advertisements
Question
The temperature at 12 noon at a certain place was 18° above zero. If it decreases at the rate of 3° per hour at what time if would be 12° below zero?
Options
12 midnight
12 noon
10 am
10 pm
Advertisements
Solution
10 pm
Explanation;
Hint:
∵ Temperature at 12 noon = 18° above zero = +18°
Rate of decrease per hour = −3°
Temperature 12° below zero = −12°
−12 is 30 units to the left of +18°
Time at which it reach −12° = `30/3` = 10 h
10 hrs after 12 noon = 10 pm
APPEARS IN
RELATED QUESTIONS
Write a pair of negative integers whose difference gives 8.
In a quiz, team A scored −40, 10, 0 and team B scored 10, 0, −40 in three successive rounds. Which team scored more? Can we say that we can add integers in any order?
Fill in the blank to make the following statement true:
−53 + ______ = −53
Fill in the blank to make the following statement true:
17 + ______ = 0
Are (11 + 7) + 10 and 11 + (7 + 10) equal? Mention the property.
Identify the problem with negative numbers as its answer:
A student was asked to subtract (−12) from −47. He got −30. Is he correct? Justify.
Encircle the odd one of the following.
Going 500 m towards east first and then 200 m back is same as going 200 m towards west first and then going 500 m back.
Write a pair of integers whose product is –36 and whose difference is 15.
