Question

Kayla plans to swim 2 laps per minute until she swims 12 laps. She figures this will take 16 minute. Which is NOT a reason why this conclusion is wrong?

Answer 1

this may because Kayla will not swim 2 laps every minute. The 16 minutes may be reached because she may have swam only one lap per minute and then gradually made it up to 2 per minute

Answer 2

It really takes her 6 min

Explanation:

We can solve this problem easily using cross-multiplication. If she swims 2 laps per minute, then how many minutes will it take her to swim 12 laps?

So in order to use cross-multiplication, let's convert the word problem into ratios:

`(2laps)/(12laps)=(1min)/(x)`

Now, we only need to solve the previous equation for x.

Hence, isolating x, we get:

`x=(12laps)/(2laps) *1min=6*1min=6min`