Question

7. The base of a triangle is increased by 25%. By
what percent should height be decreased so that
the area of the triangle will remain unchanged?
(A) 16.67%
(B) 20%
(C) 25%
(D) 33.33%
(E) 50%​

Answer 1

Step-by-step explanation:

20%

when height and base are normal =100×100

when base is increased by 25=125×x

As they are same x=(100×100)/125=80

So decrease =100-80=20