20x?=420

Question

Missingfactor

Answer 1

It's 21. (Divide 420 by 20 and it's 21.)

Answer 2

21, pretty obvious.

if we use the "2" in 20 and divide 420 by 2, we get 210.

now we remove a 0 because of the "0" in 20 which leaves us with 21.

Answer 3

2 x ? = 42

Boom, that’s your factor.