Question

Tony runs to keep fit. He wants to run a total of 20 km each week. Here are the

distances Tony ran last week.
6.25 km
4 km 750 m
872 km
Did Tony run 20 km last week? You must show how you got your answer.​

Answer 1

Tony run 19.5 km last week, so he must have run 0.5 km more, to complete 20km run last week.

Explanation:

Distance Tony ran last week are

6.25 km

4 km 750 m

872 km (Note: This would be 8
`(1)/(2)` km and not 872 km)

We will add all the distances to check if they sum up to 20km or not.

First we will convert 4 km 750 m into km

We know that 1000 m = 1 km

So, 1 m = 1/1000 km

750 m = 750/1000 = 0.75 km

Now 4km + 0.75 km = 4.75 km

So, 4 km 750 m = 4.75 km

and 8
`(1)/(2)` km = 8.5 km

Now, finding Distance covered by Tony during last week = 6.25 km + 4.75 km + 8.5 km

= 19.5 km

So, Tony run 19.5 km last week, so he must have run 0.5 km more, to complete 20km run last week.