B bearscape New member Joined Mar 9, 2011 Messages 3 Mar 9, 2011 #1 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
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 Moderator Staff member Joined Apr 12, 2005 Messages 11,325 Mar 9, 2011 #2 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.
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.
B bearscape New member Joined Mar 9, 2011 Messages 3 Mar 10, 2011 #3 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
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
B bearscape New member Joined Mar 9, 2011 Messages 3 Mar 10, 2011 #4 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
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 Super Moderator Joined Oct 6, 2005 Messages 10,958 Mar 12, 2011 #5 bearscape said: 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? Click to expand...
bearscape said: 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? Click to expand...
