Make a pattern & give a rule for a term in word symbols

                                        WALT: Make a pattern & give a rule for a term in word symbols                                                                              this is the question slide

                                                                  and this is how i did it

The question says Tom found a $20 bill on Sunday evening and spends $2 a day starting Monday.

And Tina started work on Monday and gets $2.50 a day 

So what I did was I but in my book the day Monday Tuesday etc I put Toms and Tina's name and I took $2 off Tom's and I added $2.50 to Tina's 

And the answer is 5 days  

thanks for reading :)