Question

a basket contains some yellow red and blue balls there are 15 yellow and red balls there are 18 red and blue balls total number of blue and yellow balls is 9 find number of balls for each colour​

Answer 1

red ball be x

yellow balls be y

blue balls be z

So according to the conditions

x + y =15 ----(1)

x + z = 18 -------(2)

y + z = 9 ----------(3)

adding these 3 equations

2x + 2y + 2z = 42

2(x + y + z )= 42

x + y + z = 21 ----(4)

from --- (1) putting value in (4)

15 + z =21

z = 21 - 15

z = 6

putting in ---(2)

x + z =18

x + 6 =18

x= 18 -6

x = 12

putting in eq.(1)

x + y = 15

12 + y =15

y =15 - 12

y = 3

answer

x = red ball = 12

y = yellow ball = 3

z = blue ball= 6

Answer 2

Answer:

Yellow(y) =3

Red(r)=12

Blue(b)=6

Step-by-step explanation:

y+r=15

r+b=18

b+y=9

Adding,

2(y+r+b)=42

y+r+b=21

Therefore, b=21-15=6

y=21-18=3

r=21-9=12