⦁ In a class of 25 children there are 10 girls. What percentage of the class are girls and what percentage are boys?

Girls ---> 40% Boys > 60%

Step-by-step explanation:

It is given 10 are girls, which logically implies, 15 are boys.

Now given that the total number of children in the class is 25,

Percentage of girls = 10/25 x 100 = 40%

You could do the same for boys by doing 15/25 x 100, or use some logic and realise that two sets should have a percentage of 100, therefore the percentage of boys in the class is 60%

- "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."