George found that he blinked 85 times in 15 minutes. At this rate, how many seconds passed during 51 blinks?

Question

It is a 6th grade math question and we need to know how to get the answer 540 seconds.

Answer 1

We know 15 minutes contain 15*60 = 900 seconds, the time for 85 blinks

Then the time for each blink t = 900/85

Time elapsed in seconds for 51 blinks is then 51*t = 900*51/85 = 540 seconds