what do you want from me you yes you I saw you looking at me you act like you don't even see me but you actually need me...

15. The sum of the digits of a two-digit number is 9. Four times the tens digit minus three times the ones (units) digit is 8. Construct and solve a system of equations to find the number. 54

= (substitution method)

12. Machine A can complete a job in 4 hours and Machine B can complete the same job in 2 hours. How long should it take the two machines to complete the job together? hours or 1 hour 20 minutes