Question

Олексій запалює свічки кожні 10 хвилин.Кожна свічка горить протягом 40 хвилин,а потім згасає.Скільки свічок будуть горіти через 55 хвилин після того,як Олексій запалить першу свічку? а:2 б:3 в:4 г:5 д:6

Answer 1

Через 55 хв Олексій запалить 6 свічок а 2- згасне.6-2=4

Answer 2

To solve this problem, we need to determine how many candles will be burning after 55 minutes.

We know that Alexei lights a candle every 10 minutes, and each candle burns for 40 minutes.

Let's break down the time intervals:

- After 10 minutes, Alexei will have lit 1 candle. - After 20 minutes, the first candle will still be burning, and Alexei will have lit a second candle. - After 30 minutes, the first candle will have burned out, the second candle will still be burning, and Alexei will have lit a third candle. - After 40 minutes, the second candle will have burned out, the third candle will still be burning, and Alexei will have lit a fourth candle. - After 50 minutes, the third candle will have burned out, the fourth candle will still be burning, and Alexei will have lit a fifth candle. - After 55 minutes, the fourth candle will still be burning, and Alexei will have lit a sixth candle.

Therefore, after 55 minutes, there will be 4 candles burning.

So the correct answer is в:4.