On page 76 PS problem #12, can someone explain the answer 3T + (4T+1). I don't understand were the 4t+1 comes from? The other text and video don't show how the book arrived at this answer, thanks.
GMATBootcamp
Starts Sep 28

LIVE ONLINE BOOTCAMP
Live Online Bootcamp Class with Top GMAT Expert Chris Peckover
15 live classes from Sep 28, 2026
- Schedule
- Mon to Fri · 7:00 to 10:00 PM ET
- Included
- Live classes + 6 months of TTP OnDemand
- Boost your GMAT score in less than one month in a live online class
- 6 months access to TTP OnDemand video courses included


















