mani sold his laptop at 3/5th of the price at which he bought it. What is the percentage loss that mani made?

40%

Step-by-step explanation:

3/5th of the price
if price = 100
then 3/5 is like 60/100
(multiplying by 20)
so 60/100 is 60%
mani sold his laptop for $60 that if his laptop was $100
he lost $40
which is the same value for 40/100

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."