Wire length = 40 cm. The automatic machine cuts off a piece 2 cm long from the wire every

Wire length = 40 cm. The automatic machine cuts off a piece 2 cm long from the wire every second. In how many seconds will it cut the entire wire?

Brief notation of the problem condition:

Length – 40 cm;

For 1 sec. – 2 cm of wire;

Sc. with.?

Solution:

To find in how many seconds the automatic machine will cut the entire wire, you need to divide the length of the entire wire by the length of the piece of wire that it cuts in one second.

Then:

40: 2 = 20 (s.);

Answer: 20 seconds.