Answer :
Let x be the number of months, then
15 + 7x = 50
7x = 50 - 15 = 35
x = 35/7 = 5
Therefore, there will be 50 volunteers after 5 months.
15 + 7x = 50
7x = 50 - 15 = 35
x = 35/7 = 5
Therefore, there will be 50 volunteers after 5 months.