Charlie finished 7 laps around the track, This is 20% of the number of laps he has to do. How many laps must he do?

1 Answer
Jan 2, 2017

Answer:

#"Target lap count is "35#

Explanation:

Let the target lap count be #x#

Then 7 laps = 20% of #x#

#7=20/100x#

but #20/100 = 1/5#

#7=x/5#

Multiply both sides by 5

#7xx5 = x xx 5/5#

But #5/5=1" and "7xx5 = 35#

#35=x#

#x=35#