Question

The probability os selecting a red ball at random from a jar that contain only red,blue and orange is 1/4.The probabilty of selecting a blue ball at random from the same jar is 1/3.If the jar contain 10 orange ball .Find the total no of ball in thr jar
.

Answer 1

let total no of balls be x

then - no. of red balls = x*[1/4]

no. of blue balls = x*[1/3]

no . of orange balls = 10 [given]

so x = x[1/4] +x[1/3] + 10

= x/4 + x/3 +10

=[3x + 4x]/12 +10

= 7x / 12 +10

x =[7x + 120]12

[12] x = 7x +120

12x = 7x + 120

12x -7x =120

5x =120

x =120/5

x =24

so total balls =24 (ANS).





hopes this helps!!!!!!!!!

Answer 2

let total no of balls be x
then
no. of red balls = x*[1/4]
no. of blue balls = x*[1/3]
no . of orange balls = 10 [given]
so

x = x[1/4] +x[1/3] + 10
= x/4 + x/3 +10
=[3x + 4x]/12 +10
= 7x / 12 +10
x =[7x + 120]12
[12] x = 7x +120
12x = 7x + 120
12x -7x =120
5x =120
x =120/5
x =24

so total balls =24


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