Bly sold 29 scarves last month
Solution:
Let "x" be the number of scarves sold
Bly made 7 more scarves than she sold
Then, number of scarves made = x + 7
Bly makes fleece scarves and sells them for $11 each
Thus for selling "x" scraves , he will get 11x dollars
Total sales revenue = 11x
number of scarves made = x + 7
The supplies cost her $5 per scarf
Therefore, cost for scarves made = 5(x + 7)
Therefore,
profit = Total sales revenue - cost for scarves made
profit = 11x - 5(x + 7)
profit = 11x - 5x - 35
profit = 6x - 35
Last month, Bly had a profit of $139
139 = 6x - 35
6x = 174
x = 29
Thus Bly sold 29 scarves last month