Question

A bag contains some red , blue and black balls .The number of black balls are twice the blue balls and half of red balls . If the bag contains 36 balls the number of black balls are

Answer 1

Let the black balls be x

Blue balls=2x

Red balls=(x/2)

Total balls = x+2x+(x/2)=36

x+2x+x=36

4x=36*2

4x=72

x=18

Therefore there are 18 black balls