Guys,

This probably is very silly question but might puzzle few ppl.
so who is first to answer ?

16-36+20 1/4 = 25-45+20 1/4
16-36+81/4 = 25-45+81/4
(4 -9/2)(sq) = (5-9/2) (sq)
4 -9/2 = 5 -9/2
4 =5