Question

If a cow has a mass of 9 × 10^2

kilograms, and a blue whale has a mass of 1.8 × 10^5 kilograms, which of these statements is true?

a) The blue whale has about 200 times more mass.

b) 

The cow has about 200 times more mass.

c) The blue whale has about 500 times more mass.

d)  There is no way to compare the masses.

Answer 1

a) The blue whale has about 200 times more mass.

Explanation:

A cow has a mass of 9 × 10^2 kilograms, and a blue whale has a mass of 1.8 × 10^5 kilograms.

The blue whale is about
`(1.8*10^(5))/(9*10^(2))` times more than cow.

=
`(180000)/(900)`

= 200

Hence, the answer is a) The blue whale has about 200 times more mass.

Answer 2

a) The blue whale has about 200 times more mass

Explanation:

(blue whale mass)/(cow mass) = (1.8×10^5 kg)/(9×10^2 kg)

... = (1.8/9)×10^(5-2)

... = 0.2×10^3

... = 200

The blue whale has about 200 times as much mass as a cow.