## Task 1

Three pioneers collected a total of $139 \mathrm{~kg}$ of scrap. The first pioneer brought $36 \mathrm{~kg}$ to the collection point, and the second brought twice as much.

How many kilograms of scrap did the third pioneer collect?
$36+36=72 ; 72 \text{ kg}$ scrap; $139-72-36=31 ; 31 \text{ kg}$ scrap.