Ex.1.1 Q3 Integers - NCERT Maths Class 7

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Question

In Srinagar, temperature was \(–5^\circ \rm C\) on Monday and then it was dropped \(2^\circ \rm C\) on Tuesday. What was the temperature of Srinagar on Tuesday? On Wednesday it rose up by \(4^\circ \rm C.\) What was the temperature on this day?

Text Solution

What is known?

Different days and their respective temperatures.

What is the unknown?

The temperature of Srinagar on Tuesday and Wednesday. 

Reasoning:

Steps:

Temperature of Srinagar on Monday\(= \,–5^\circ \rm C\)

On Tuesday it  was dropped by \(2^\circ \rm C\)

Temperature on Tuesday

\[\begin{align}&= -5^\circ \rm C - 2^\circ  \rm C \\ &={{\rm -7^\circ C}}\end{align}\]

On Wednesday it rose up by \(4^\circ \rm C\)

Temperature on Wednesday

\[\begin{align}&= -7^\circ \rm C\,{\rm{ + }}\,{\rm{4^\circ C}}\\&={\rm{   -3^\circ C}}\end{align}\]

Thus, temperature on Tuesday was \(–7^\circ \rm C\) and on Wednesday was \(–3^\circ \rm C.\)

  
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