KING Solomon Omorogie

PRESIDENT TINUBU HAS ORDERED THAT THE FOOD PRICES FALL. HAS FOOD PRICES GONE SOUTH

A bag contains 5 blue balls, 7 green balls and a number of white balls. All the balls are the same size. If the probability of picking white balls is 1/5. Calculate:
1. the number of white balls
2. total number of the balls.
Solution:
Let the number of the white ball be x.
Total ball = 5+7+x
=12+x
Equate the probability of white balls.
1/5=x/12+x
Cross multiply
5x=12+x
Collect like terms
5x-x=12
4x=12
Divide both sides by 4
x=3.
Therefore Total number of balls = 5+7+3=15.