web2.0calc
 
+0  
 

 Please help. Thanks

0
44
2
avatar+20 

At a stationery shop, the ratio of the number of blue pens to the number of red pens is 4:5. After 280 blue pens and 280 red pens were sold, the ratio of blue pens to the red pens became 9:20. How many pens were there at the stationery shop at

first?

 Oct 15, 2023

1+0 Answers

 #2
avatar+33661 
+2

Let b = initial number of blue pens and r = initial number of red pens.

 

Form the following two equations and solve them for r and b:

 

\(\frac{b}{r}=\frac{4}{5}\\ \frac{b-280}{r-280}=\frac{9}{20}\)

 Oct 17, 2023

3 Online Users

Top Users

avatar+129895 CPhill moderator
avatar+118680 Melody moderator
avatar+33661 Alan moderator
avatar+15000 asinus moderator
avatar+2499 Solveit
avatar+2489 GingerAle
avatar+1926 NotThatSmart
avatar+1557 parmen
avatar+1471 blackpanther
avatar+1439 kittykat
avatar+1286 learnmgcat

Sticky Topics