[ Arithmetic. Mental arithmetic, etc.] $[$ Work problems $]$

Three diggers dug three holes in two hours. How many holes will six diggers dig in five hours?

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First, calculate how many pits 6 diggers will dig in 2 hours.

## Solution

Six diggers will dig $2 \cdot 3=6$ pits in 2 hours. And in 5 hours, they will dig $2.5 \cdot 6=15$ pits.

## Answer

15 pits.