Eduardo blinked 126 times in 4.5 minutes. Which of the following is NOT an equivalent number of blinks per minute? a) 140 blinks in 5 minutes b) 224 blinks in 8 minutes c) 168 blinks in 6 minutes d) 189 blinks in 7 minutes
To find the equivalent number of blinks per minute, we can divide the total number of blinks by the total number of minutes.
For Eduardo, we have 126 blinks in 4.5 minutes, which gives us: $\frac{126}{4.5} = 28$ blinks per minute.
Now, let's calculate the equivalent number of blinks per minute for each option:
a) $\frac{140}{5} = 28$ blinks per minute. (Equivalent)
b) $\frac{224}{8} = 28$ blinks per minute. (Equivalent)
c) $\frac{168}{6} = 28$ blinks per minute. (Equivalent)
d) $\frac{189}{7} \approx 27$ blinks per minute.
Therefore, the answer is $\boxed{\text{(d) } 189 \text{ blinks in 7 minutes}}$, as it is not an equivalent number of blinks per minute.
To find the equivalent number of blinks per minute, we need to find the blink rate per minute for each given option and compare it with the original rate of 126 blinks in 4.5 minutes.
a) 140 blinks in 5 minutes:
To find the equivalent rate per minute, we can divide the total number of blinks (140) by the total number of minutes (5):
140 blinks / 5 minutes = 28 blinks/minute
b) 224 blinks in 8 minutes:
Again, we divide the total number of blinks (224) by the total number of minutes (8):
224 blinks / 8 minutes = 28 blinks/minute
c) 168 blinks in 6 minutes:
Dividing the total number of blinks (168) by the total number of minutes (6):
168 blinks / 6 minutes = 28 blinks/minute
d) 189 blinks in 7 minutes:
Once again, we divide the total number of blinks (189) by the total number of minutes (7):
189 blinks / 7 minutes = 27 blinks/minute
Comparing the calculated blink rates with the original rate, we can see that option d) 189 blinks in 7 minutes is NOT an equivalent number of blinks per minute as it gives a rate of 27 blinks/minute, which is one less than the original rate of 28 blinks/minute. Therefore, the correct answer is d) 189 blinks in 7 minutes.
To determine which of the given options is NOT an equivalent number of blinks per minute, we need to calculate the blinks per minute for each option.
To calculate the blinks per minute, we can divide the number of blinks by the number of minutes.
For option a) 140 blinks in 5 minutes:
Blinks per minute = 140 blinks / 5 minutes = 28 blinks per minute
For option b) 224 blinks in 8 minutes:
Blinks per minute = 224 blinks / 8 minutes = 28 blinks per minute
For option c) 168 blinks in 6 minutes:
Blinks per minute = 168 blinks / 6 minutes = 28 blinks per minute
For option d) 189 blinks in 7 minutes:
Blinks per minute = 189 blinks / 7 minutes = 27 blinks per minute
So, the option that is NOT an equivalent number of blinks per minute is d) 189 blinks in 7 minutes.