Question 1161076

Nicki has {{{n}}} stamps. 

She has half as many stamps as Mark has.=> Mark has {{{2n}}} stamps
Together, Nicki and Mark have:{{{3n}}}stamps

if Nicki and Mark together  have {{{100}}} more stamps than Basilio,

in terms of {{{n}}}, Basilio have {{{3n-100}}} stamps