7. From 16 m of fabric, 4 men's and 2 children's coats were sewn. How many meters of fabric are needed to sew one men's and one children's coat, if from 18 m of the same fabric, 2 men's and 6 children's coats can be sewn
7. Let's make a brief record of the problem's condition:

$$
\begin{aligned}
& 4 \text { m, } 2 \text { d }-16 \text { m; } \\
& 2 \text { m, } 6 \text { d }-18 \text { m. }
\end{aligned}
$$

To ensure that the brief record contains the same quantities, we will double the second order:

$$
\begin{aligned}
& 4 \text { m, } 2 \text { d }-16 \text { m} ; \\
& 4 \text { m, } 12 \text { d }-36 \text { m} .
\end{aligned}
$$

1) $12-2=10$ (d) - by this much more children's coats were ordered the second time;
2) $36-16=20$ (m) - by this much more fabric was used for children's coats the second time;
3) $20: 10=2$ (m) - the amount of fabric needed to sew one children's coat;
4) $16-2 \times 2=12$ (m) - the amount of fabric remaining for the first order of 4 men's coats;
5) $12: 4=3$ (m) - the amount of fabric needed to sew one men's coat.

Answer: 3 meters of fabric are needed to sew one men's coat, and 2 meters for one children's coat.

## SEVENTEENTH