Mandy paid 1/3 * 30 = 30 / 3 = $<<30/3=10>>10 for her first month of data.
She paid 30 + 15 = $<<30+15=45>>45 for her fourth month of data.
Minus those two months, she had 6 - 2 = <<6-2=4>>4 months of regular charges.
Thus, Mandy paid 4 * 30 + 10 + 45 = 120 + 55 = $<<4*30+10+45=175>>175 for the first 6 months for data.
#### 175