Question

Martina needs to memorize words on a vocabulary list for German class. She has memorized 20 of the words, which is four-fifths of the list. How many words are on the list?

Answer 1

25 words

Explanation:

use a proportion

20/x=⅘

cross multiply

X×4 and 20×5

4x=100

÷4. ÷4

x=25

25 words

check

20/25=4/5

Answer 2

Four fifths of 25 is 20 so the answer is 25