Answer:
Lost 6 pounds
Step-by-step explanation:
While all three were healthier after six weeks,
- the first friend had lost 5 pounds (this means [tex]-5[/tex]),
- the second friend had gained 3 pounds (this means [tex]+3[/tex]),
- the third friend had lost 4 pounds (this means [tex]-4[/tex]).
In total, they lost 6 pounds because
[tex]-5+3-4=-2-4=-6[/tex]