An adult blinks about 450 times in 30 min. a 12 year old blinks about 150 times in 15 min. how many more times does an adult blink in 60 min. than a 12 year old?

300 times more.

Step-by-step explanation:

An adult blinks about in 30 minutes = 450 times

An adult blinks in one minute =  

                                                 = 15 times

In 60 minutes an adult blinks = 60 × 15 = 900 times

A 12 year old blinks about in 15 minutes = 150 times

A 12 year old blinks in one minute =  

                                                         = 10 times

In 60 minutes a 12 year old blinks = 60 × 10 = 600 times

The difference between the number of blinks in 60 minutes = 900 - 600

                                                                           = 300 times

In 60 minutes an adult blink 300 times more than a 12 year old.

ad = ae + ed = y + 7

similar triangles therefor

ac/ab = ad/ae

6/4 = (y + 7) / y

cross multiply

6y = 4(y + 7)

6y = 4y + 28

2y = 28

y = 14

step-by-step explanation: