Can't figure out the answer. Im confused please Help!

Question

A poster sells stamps usually in the proportion of fifteen 5-centavo stamps to every six 6-centavo stamps and every four 30-centavo stamps in ordering 15,000 of these stamps. How many more 5-centavo than 6-centavo stamps should be ordered?

Answer 1

15:6:4 means that there are 15 + 6 + 4 = 25 total parts.

 

15000/25 = 600 times the 25 parts occur.

 

There are 9 more 5 than 6 each time the 25 parts occur. 9(600) = 5400 more.

 

Let's check. 15(600) = 9000. 6(600) = 3600. 4(600) = 2400. The three together equal 15,000 and 9000 - 3600 = 5400.

 

Boom.

Answer 2

Stamps are sold in the ratio of 15 : 6 : 4.

This is a group of 25 (15+6+4)

15,000 ÷ 25

600

 

15(600) 5-centavo

6(600) 6-centavo

4(600) 30-centavo