the ratio of jessica's stickers to rod sticker's is 7:4. jessica has 31 stickers. how many stickers does rod have?

Question

 The ratio of Jessica's stickers to Rod's sticker is 7:3.  Jessica has 21 stickers.  How many stickers does Rod have?

Answer 1

ratio of jessica's stickers to rod sticker's is 7:3.

 

Let Rod has  x stickers

    Jessica / Rod

       7/3  =21/x

By cross multiplication

7x =63

x =9

Rod has 9 stickers

Answer 2

You changed your numbers between the heading and restatement...

 

7:4::31:x

 

7x = 4(31)

x = 4(31)/7

x = ___ stickers

 

7:3::21:x

7x = 3(21)

x = 3(21)/7

x= __ stickers