# Digging companies

Company A would dig a pit for 12 days, company B for 15 days, company C for 20 days and the company D for 24 days. Work began together companies C and D, but after three days joined them other two companies. How long took to dig a pit?

x =  0 d

### Step-by-step explanation:

Equation is non-linear.

## Calculation:

Equation is linear and have one solution:

29x-174=0

x=6

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