Question

Pelomyxa palustris is an amoeba with a length of 4.9 mm.Amoeba proteus has a length of 0.7 mm.How many amoeba proteus would you have to line up to equal the length of three pelomyxa palustris?

Answer 1

21

Explanation:

1. 49

x 3 1

14.7.

21 _=period move

2. 0.7./14.7.

-14

07

-7

0

check your answer:

21

x0.7. 1

14.7.

Answer 2

21

Explanation:

Let n represent the number we're looking for. Then ...

n × (proteus length) = 3 × (palustris length)

n × 0.7 mm = 3 × 4.9 mm

n = (3 × 4.9 mm)/(0.7 mm) = 3 × 49/7 = 3 × 7

n = 21

You would have to line up 21 amoeba proteus to equal the length of three pelomyxa palustris.