B Nirmala Shastry Solutions for Exercise 6: MIXED BAG...A REVISION EXERCISE

Express the following using integers and find its value
A trader gains $₹ 100$ then loses $₹ 70$ and then gains $₹ 20$.
 

Express the following using integers and find its value
A snail climbs $2 \mathrm{m}$ upwards on a wall from a given point, slips down $4 \mathrm{m}$ and then climbs $3 \mathrm{m}$ upwards again.
 

Express the following using integers and find its value
A cricket team plays some matches; wins $10$, loses $6$, wins $2$ and loses $3$ matches.

If (i) $x+n$ means the temperature is $x°$ and rises by $n$ degrees and (ii) $x-n$ means the temperature is $x°$ and drops by $n$ degrees, what do the following statement signify?

$-5-2$

If (i) $x+n$ means the temperature is $x°$ and rises by $n$ degrees and (ii) $x-n$ means the temperature is $x°$ and drops by $n$ degrees, what do the following statements signify?
$8-3$
[Hint: In case of (a) temperature is first $-5°$ and drops $2°$. It is more colder now than before.]

If (i) $x+n$ means the temperature is $x°$ and rises by $n$ degrees and (ii) $x-n$ means the temperature is $x°$ and drops by $n$ degrees, what do the following statements signify?

$-3+4$
[Hint: In case of (a) temperature is first $-5°$ and drops $2°$. It is more colder now than before.]

If (i) $x+n$ means the temperature is $x°$ and rises by $n$ degrees and (ii) $x-n$ means the temperature is $x°$ and drops by $n$ degrees, what do the following statements signify?
$3+5$
[Hint: In case of (a) temperature is first $-5°$ and drops $2°$. It is more colder now than before.]

An elevator descends into a mine shaft at the rate of $7 \mathrm{m}$ per minute. If the descent starts from $20 \mathrm{m}$ above the ground level, find the time taken by the elevator to reach $-400 \mathrm{m}$.