Carl saved in 6 weeks $25/week x 6 weeks = $<<25*6=150>>150
On the seventh week, he ended up having to pay in bills $150/3 = $<<150/3=50>>50
His savings were then $150 - $50 = $<<150-50=100>>100
His dad gave him $170 – $100 = $<<170-100=70>>70
#### 70