Question 1010960
Actual:
{{{(6500/p)}}}, birr per person


Hypothetical:
Same 6500 birr but now, p+15 people.
{{{6500/(p+15)}}} birr per person


The hypothetical makes for 30 birr less for "per person".
{{{highlight_green(6500/p-6500/(p+15)=30)}}}
Solve for p.