Question

PLEASE HELP!!! I PUT 50 POINTS

Answer 1

7

Explanation:

1/3 = ?/21

1*? =?

3*? = 21

1*7 = 7

3*7 = 21

Answer 2

x=7

Explanation:

7 times 3 =21 and 21 times 1 =21 cross multiply or butterfly method