Why is this equal to 4?

Question

What equation is used to make every number equal to 4?
49=9=4

7=5=4

89=10=3=5=4

91=9=4

894=25=11=5

20=6=3=5=4

-4=12=6=3=5=4

Answer 1

each number represents how many letters make up that number when it is spelled out.

49 (forty nine) = 9 because there are nine letters in it
9=4 because there are four letters in the word nine