Let a be the amount of time Maryann spends doing accounting and c be the amount of time she spends calling clients: We know that a + c = 560 and a = 7c.
Substituting the second equation into the first equation, we get 7c + c = 560
Combining like terms, we get 8c = 560
Dividing both sides by 8, we get c = 70
#### 70