Question

Eighteen balls are kept in a box some balls are red and remaining balls are blue. twice the number of red balls exceeds thrice the number of blue balls by 1 .the number of red balls in the box is​

Answer 1

Answer

let number of blue balls = n

∴ total balls = (n+5)

P(blue ball) = n+5n​

P(red ball) = n+55​

as per question,

P(blue ball) = 3 × P(red ball)

n+5n​ = 3×n+55​

∴n=15