proportions
4/9 = x/63
4 x 7= 28
x=28
A bag has 2 pink, 3 black and 2 white balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
10/21
74 ÷ 2
37
20 x 20
400
( 6 x 4) ÷ 3 - 6 +2
24 ÷ 3 - 6 +2=
8-6 + 2=
2+2=
4
x/9 = 2/3
x= 6
In a box, there a 8 baby blue, 7 red, green balloons. One balloon is picked one randomly. What is the probability that it is neither baby blue nor green?
1/3
674 ÷ 5
134.8
188 x 99
18,612
(5-3)(5+3)
5/15= 6/12
60 = 90
5 * 12 = 15 * 6
60= 15* 6
Tickets numbered 1 to 20 are mixed up and then ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?
9/20
144 ÷ 4
36
646 x 4
2,584
(30-10) + (9*9)
101
10/ 200 = 50/400
4000= 10000
10 * 400 = 200 * 50
4000= 200 * 50
What is the probability of getting of getting a sum 9 from two throws of a dice?
1/9
16,204 ÷ 2
8,102
733 x 64
46,912
(56* 6)- 30 +6
312
1.5/7= 3.5/6.5
9.75/24.5
Three unbiased coins are tossed. What is the probability of getting at two heads?
7/8
422 ÷ 2
211
3,743 x 73
138,491
60-(40-10+80*8
670