Question

There are 20 balls in a bag. Ten of the balls are red, 4 are green, and the rest are yellow.

Which ratio represents the number of yellow balls to red balls?

1:5

3:10

2:5

3:5

Answer 1

3:5


10 red

6 yellow

out of 20

half both of the numbers it equals 5 and 3

Answer 2

Find out the ratio represented the number of yellow balls to red balls .

To proof

Let us assume that the number of yellow balls be x.

As given

There are 20 balls in a bag.

Ten of the balls are red, 4 are green, and the rest are yellow.

than the equation becomes

x + 10 + 4 = 20

x = 20 - 14

x = 6

therefore the number of yellow balls be 6 .

Now find out the ratio between the the number of yellow balls to red balls .

the number of yellow balls be 6 .

the number of red balls be 10 .

`(Number\ of\ yellow\ balls)/(Number\ of\ red\ balls) = (6)/(10)`

solving

`(Number\ of\ yellow\ balls)/(Number\ of\ red\ balls) = (3)/(5)`

Therefore the ratio of the the number of yellow balls to red balls is 3 :5 .

Option (d) is correct .

Hence proved