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

Answer 1

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.