Hawkeye is driving to his aunt. He has to charge his battery for $3.5 per charge. If he charged his battery four times, and his battery charging budget was $20, how much money was he left with when he reached his aunt's place?
If each battery charge costs $3.5, the total expense of 4 battery charges is 4*3.5 = $<<4*3.5=14>>14.
After his expense on battery charging, his balance was 20-14 = $<<20-14=6>>6.
#### 6