Question

plz solve the ¡¡) question...​

Answer 1

This is the 1st answer

Answer 2

Answer:

8

Step-by-step explanation:

18 balls are there,

x are red .

18 - x are not red .

(i)

P ( not red ) = ( 18 - x ) / 18

ANSWER :

( 18 - x ) / 18

(ii)

2 more red balls are put .

Total balls = 18 + 2 = 20

Red balls = 2 + x

P = 9/8 (  x )/18

= ( x )/16

Probability = ( 2 + x )/20

So :

( 2 + x ) / 20 = x / 16

= 16 ( 2 + x ) = 20 x

= 4 ( 2 + x ) = 5 x

= 8 + 4 x = 5 x

= x = 8

The number of balls is 8 .