There are 80 new houses being built. Last month 1/5 of them were sold. This month 5/8 of the remaining houses were sold. How many houses are left to be sold

20

Step-by-step explanation:

40

Step-by-step explanation: First, 1/5 of the 80 houses were sold last month. 80x1/5 is 16. We now know that 16 of the houses were sold, so 80-16 is 64. In the second part of the question, 5/8 of the remaining houses were sold this month. So, 64x5/8 equals 64 divided by 8 times 5. 8x5=40, and we have 40 houses left over. Therefore, there are 40 houses left to be sold.

i dont know

step-by-step explanation:

- "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."