Ratio Problem

[bearscape]

Hi

I am having trouble figuring this problem.

A painter made a mixture of 3 parts blue to 5 parts white. He wants to change the mixture so that it is 70% white. How many parts white must he add.



thank you

 

[tkhunny]

Define!! (aka Name Stuff)

W = The parts of white paint requred

What we have now: \(\displaystyle \frac{5}{5+3}\)

What we want: \(\displaystyle \frac{5+W}{5+3+W} = 0.70\)

Stare at it until it soaks in.

 

[bearscape]

Thank you, but i am in grade 5 and we did not learn how to solve the problem this way yet. The text book is not good.

thank you

 

[bearscape]

okay I understand that in order for me to figure this I need to know that 0.7 has a fraction is 7/10 so the w has to be 2. I think

 

[mmm4444bot]

I need to know that 0.7 has [Rational form] 7/10 Yes, you do!


w has to be 2. I think You can check this result. What's the percentage of white, after adding 2 parts white to the initial mixture?