Question

A bag contains green and red balls . The ratio of numbers of green to red balls is 3:4 . If the bag contains 140 balls then how many red balls are there in the bag ? ​

Answer 1

let the ratio constant be x

then green balls=3x

and red balls=4x

given

3x+4x=140

7x=140

x=20

red balls=4x

=4×20=80 red balls

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Answer 2

Step-by-step explanation:

let the ratio constant be X

so number of green balls will be 3x

and the number of red balls will be 4x

according to question,

total number of balls=140

Number of green balls+number of red balls=140

3x+4x=140

7x=140

x=140/7

x=20

so number of red balls 4×20=80

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