Question

option.
OPTIONS
A painter has a 90 litres mixture of red paint and yellow paint in the ratio 7:2. How much yellow paint
must be added to make the ratio 7:37
5 litres
15 litres
20 litres
10 litres​

Answer 1

Answer:

Step-by-step explanation:

20

Answer 2

Answer:

Concept:

Comparing two amounts of the same units and determining the ratio tells us how much of one quantity is in the other. Two categories can be used to categorize ratios. The part to the whole ratio is one, and the part to part ratio is the other. The part-to-part ratio shows the relationship between two separate entities or groupings.

Step-by-step explanation:

Given:

A painter has a 90 liters mixture of red paint and yellow paint in the ratio of 7:2.
Find:

How much yellow paint must be added to make the ratio 7:37

Solution:

So we have a 90 liters mixture of red paint and yellow paint in a ratio of 7:2.

That means we can write it as

           7x + 2x = 90

                  9x  = 90

                     x = 90/9

                     x = 10

So from the value of x, we can get how many liters of each painting we have

         7x = 70 liters of  Red paint

         2x = 20 liters of  Yellow paint

Now we need to find out how much Yellow paint needs to be added so that the ratio becomes 7:37

          $\frac{7x}{37x}$   =  $\frac{70}{20}$

         37 x  =  37 (10)  =  370

Now we need to find how much Yellow paint needs to be added, for that let us subtract the existing  value which is 20 liters

         370 - 20 = 350 liters

       

Hence 350 liters of Yellow paint needs to be added to become the ratio 7:37

#SPJ3