Question

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

Answer 1

first convert the 15 minutes to seconds
60 sec-= 1 minute
900 sec = 15 minutes

ratio and proportion

85 blinks/900 sec= 51 blinks/ x seconds

cross multiply
85x=45900
divide by 85
x= 540 seconds
hope this helps