Question

The length of a blue whale is approximately 3 × 104 millimeters; the length of an otter is 2 × 103 millimeters. How many times longer is the blue whale than the otter?
 1.5 millimeters
 2 millimeters
 10 millimeters
 15 millimeters

Answer 1

Answer:  Last option is correct.

Step-by-step explanation:

Since we have given that

Length of a blue whale is given by

$3\times 10^4$

Length of an otter is given by

$2\times 10^3$

Number of times the blue whale is longer than the otter is given by

$\frac{\text{Length of a blue whale}}{\text{ Length of an otter}}\\\\=\frac{3\times 10^4}{2\times 10^3}\\\\=\frac{3\times 10000}{2\times 1000}\\\\=\frac{30}{2}\\\\=15\ millimeters$

Hence, Last option is correct.