Question

a painter has 90litres of red paint and yellow paint In the ration 7:2 how much yellow paint must be added to make the ration 7:3​

Answer 1

Given:

Required ratio of yellow paint to the blue paint =3:2

Amount of yellow paint used =12 L

Therefore,

Amount of blue paint used =  

3

12×2

​

=8 L

Answer 2

To find:

How much yellow paint must be added to make the ratio of red paint and yellow paint 7 : 3

Step-by-step explanation:

Given, the ratio of red paint and yellow paint is 7 : 2

Then the fraction for red paint = 7/(7 + 2) = 7/9

and the fraction for yellow paint = 2/(7 + 2) = 2/9

Here, total paint = 90 litres

So the amount of red paint

= 7/9 × 90 litres

= 70 litres

and the amount of yellow paint

= 2/9 × 90 litres

= 20 litres

Given, the ratio of red paint and yellow paint

= 7 : 3

= (7 × 10) × (3 × 10)

= 70 : 30

Thus to make the ratio 7 : 3, the yellow paint must be 30 litres.

Therefore the amount of yellow paint to be added

= (30 - 20) litres

= 10 litres

Answer:

10 litres of yellow paint must be added to make the ratio of red paint and yellow paint 7 : 3

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