Question

20 beads in a box, some are red and some are green. The chance of that bead taking at random from the box is red is 1/4. Find the number of red beads in the box

Answer 1

Answer:

There are 18 beads in a box. Some of them are white and the remaining are black. The probability of drawing a black bead from it is

3

1

. Then

(a) How many black beads are there in the box?

(b) How many white beads are there in the box?

(c) How many white beads should be added to it so that the probability of drawing a black head becomes

4

1

?