Question

solve persentage increase or percentage decrease......solve q 7, 8 pllzz very important to me............

Answer 1

7] Let the percentage he got in the third paper be x.

According to the problem:

[45+70+x] / 3 = 60

=>45+70+x = 60×3 = 180

=>x=180-45-70

=180-(45+70)

=180-115

=65%

Answer=65%

TO CHECK:

Average of 45,70 and 65

=[45+70+65]/3

=180/3

=60%

:. He got 65 % in the third paper.

8]   let the original population be x

⇒x + [15x/100] = 19320

⇒115x / 100 = 19320

⇒x = 19320 * 100 / 115

⇒x  =168 * 100

⇒x =  16800 ANS