Question

At Srinagar temperature was $-5^{\circ }C$ on Monday and then it dropped by $2^{\circ }C$ on Tuesday. What was the temperature of Srinagar on Tuesday? On Wednesday, it rose by $4^{\circ }C$. What was the temperature on Wednesday? If the temperature drops by $2^{\circ }$ each day after Wednesday, then, find the temperature on Saturday. [4 MARKS]

Answer 1

Steps: 1 Mark
Temperature on Tuesday: 1 Mark
Temperature on Wednesday: 1 Mark
Temperature on Saturday: 1 Mark

Temperature on Monday =$-5^{\circ }C$

Temperature on Tuesday = Temperature on Monday $-2^{\circ }C$

$=-5^{\circ }C-2^{\circ }C=-7^{\circ }C$

Temperature on Wednesday = Temperature on Tuesday $+4^{\circ }C$

$=-7^{\circ }C+4^{\circ }C=-3^{\circ }C$

Therefore, the temperature on Tuesday and Wednesday was $-7^{\circ }C$ and $-3^{\circ }C$ respectively.

Given that
The temperature drops by $2^{\circ }$ each day after Wednesday
The temperature on Wednesday = $-3^{\circ }C$
The temperature on Saturday
$=-3-(2\times 3)=-3-6=-9^{\circ }C$

The temperature on Saturday is $-9^{\circ }C$