Question

how 20=4R is 80 it should be 5​

Answer 1

Answer:

20 = 4R is 80 it happen by mistake

Answer 2

$20 = 4R \\ then \\ \: \: \: \: \: \: \: R = 5$

It can't be 80. Might there would be some other equation.

For e.g :- $\:\:\:20 = \frac{R}{4}$