Question 1049067
{{{n}}}=  number of members of the marching band.
If the band enrolled {{{3}}} more members,
they would have {{{n+3}}} members.
Then, they could group there members in lines of 4, 5, or 7,
And they would have full, even lines.
That means that {{{n+3}}} is a multiple of r, 5, and u.
The smallest such number is {{{4󬊇=140}}} ,
and the other such numbers are multiples of 140, all much greater than 20p.
So, {{{n+3=140}}} ,and
the band has {{{140-3=highlight(137)}}} members.