Answer:
Shay can give lip gloss to 15 friends.
Explanation:
Given:
shay has 100 tubes of lip gloss.
She keeps 10 for herself.
Number of Lip gloss remaining = Total number of Lip Gloss
Number of Lip gloss she keeps for herself =

she allows friends to pick 6 tubes of lip gloss
Each friend can have lip gloss = 6 tubes.
Total Number of friends whom she can give lip gloss =

Hence she can give 15 Friends the remaining Lip gloss.