Question

A piece of wire 6 cm long weighs 30 grams. What is the weight of an 8 m length of the same wire?

A) 400 grams
B) 425 grams
C) 640 grams
D) 4000 grams​

Answer 1

4000 gm

Explanation:

We can use ratios to solve

Change 8 m to cm

8m * 100cm/1m = 800 cm

6 cm 800 cm

------------- = ------------

30 grams x gm

Using cross products

6 * x = 800 * 30

6x = 24000

Divide by 6

6x/6 = 24000/6

x = 4000 gm