Question

In a box there are 20 red marbles, 30 blue marbles and 50 black marbles. Find the ratio of
:(a)red marbles to blue marbles
(b)blue marbles to black marbles
(c)red marbles to blue and black marbles
(d)black marbles to total number of marbles

Answer 1

total no. of marbles= 20+30+50=100

red marbles = 20

blue marbles= 30

black marbles=50

a) probability of red to blue marbles = 20/30= 2/3 2:3

b) blue to black marbles = 30/50=3/5=3:5

c)probability of red marbles to blue and black marbles = 20/30+50 = 20/80=

1/4= 1:4

d)probability of black marbles to total no. of marbles = 50/100= 1/2=1:2

so the ratios are 2:3, 3:5, 1:4 and 1;2