If one side of a square is increased by 30%, by what percentage anoth…

Area = Side₁ × Side₂

*(When area is constant, then the relation b/w sides are inversely proportional)

Side₁  :  10  :   13

Side₂  :  13  :   10

Side₂ should be reduced by = 13 - 10 = 3

So, Reduce percent = \(\frac{3}{13}\) × 100 = 23\(\frac{1}{3}\)%