ratios and proportions

[namdionwuachu]

I need help with these questions ... your help will be appreciated.

my approach to get the amount of green pens did not add up considering the red and black pens. Then I found the amount of pens/colour per bag a bit of a distraction.
Your help will be appreciated. Thanks in advance

 

[lev888]

Please post your work.
Why is pens per pack info a distraction if the question is 'how many pens...?' How would you calculate the number of pens without knowing how many pens are in a pack?

 

[namdionwuachu]

I don't know if say on Monday there were 53 pens in total sold. How did we get to 212 pens and how do we work out the proportions per the colours? As the question gave us the ratios on a Monday but did not say more then gives us a total number of pens.

 

[lev888]

I don't know if say on Monday there were 53 pens in total sold. How did we get to 212 pens and how do we work out the proportions per the colours? As the question gave us the ratios on a Monday but did not say more then gives us a total number of pens.

1. You know the ratio of packs. You know the numbers of pen per pack. What's the ratio of pens?
Hint: if ratio of cars to bikes is 5:3, what's the ratio of car wheels to bike wheels?

2. Given the ratio of pens and the total, can you set up an equation?

 

[namdionwuachu]

you are on the money... the number of packs sold per colour was not exactly the "ratio of pens" however the ratio of pens is determined by the number of pens per pack (per colour) * the number of packs sold ( per colour) on the said Monday. on that day we had a total of 212 pens sold. Therefore ratio of pens: black 14: red 15: green 24, hence for green 24/53 *212 = 96 ... and it all adds up neatly for the others.