An adult blinks about 450 times in 30 minutes. A 12 year old blinks about 150 times in 15 minutes. How many more times does an adult blink in minutes than a 12-year-old?

##5## times more per minute.

To solve this, we need to divide times by minutes. Like for adults, it would be:

##450/30=150##

and for 12 year old:

##150/15=10##

But we will take it for ##30## minutes so:

##300/30=10##

Now, we need to subtract it:

##450/30-300/30##

##150/30##

##5##

That means adult blinks 5 times more than a 12 year old boy per minute.