Proportions

Question

Didi takes her pulse for 10 sec and counts 13 beats. How many beats per minute is this?

Answer 1

A minute has 60 sec.  10 sec is 10/60 = 1/6 of one minute.

 

Therefore, if she counts 13 beats in 10sec, that means she counts 13 beats in 1/6 of a minute, and the total beats in one minute will be:

 

6 x 13 = 78 beats