Question

Туристы должны пройти 140 км за три дня.За первый день они прошли 2/7 маршрута,а во второй 80%остатка.Сколько км прошли туристы за третий день? Решите пожалуйста

Answer 1

1)140÷7×2=40 (км) - за первый день;
2)140-40=100 (км) - остаток;
3)100÷100×80=80 (км) - за второй день;
4)80+40=120 (км) - за первый и второй день вместе;
5) 140-120=20 (км) - за третий день;

Answer 2

1) за первый день прошли 2/7 пути: 140:7•2= 40км, следовательно, осталось ещё 140-40= 100км
2) за 2 день прошёл 80% остатка: 100:100•80= 80км
3) 1 день+ 2 день= 40+80= 120км
Т.о. осталось пройти 140-120= 20км
Ответ: 20км

Answer 3

#### Problem Analysis We are given that a group of tourists needs to cover a distance of 140 km in three days. On the first day, they covered 2/7 of the route, and on the second day, they covered 80% of the remaining distance. We need to find out how many kilometers the tourists covered on the third day. #### Calculation To solve this problem, we can break it down into steps: 1. Calculate the distance covered on the first day. 2. Calculate the remaining distance after the first day. 3. Calculate the distance covered on the second day. 4. Calculate the remaining distance after the second day. 5. Calculate the distance covered on the third day. Let's calculate each step one by one. #### Step 1: Distance covered on the first day The tourists covered 2/7 of the total distance on the first day. To find this distance, we can multiply the total distance by 2/7. Distance covered on the first day = (2/7) * 140 km #### Step 2: Remaining distance after the first day To find the remaining distance after the first day, we subtract the distance covered on the first day from the total distance. Remaining distance after the first day = Total distance - Distance covered on the first day #### Step 3: Distance covered on the second day The tourists covered 80% of the remaining distance on the second day. To find this distance, we can multiply the remaining distance after the first day by 80%. Distance covered on the second day = 80% * Remaining distance after the first day #### Step 4: Remaining distance after the second day To find the remaining distance after the second day, we subtract the distance covered on the second day from the remaining distance after the first day. Remaining distance after the second day = Remaining distance after the first day - Distance covered on the second day #### Step 5: Distance covered on the third day To find the distance covered on the third day, we subtract the remaining distance after the second day from the total distance. Distance covered on the third day = Total distance - Remaining distance after the second day Let's calculate each step using the given values. #### Calculation: Step 1: Distance covered on the first day Distance covered on the first day = (2/7) * 140 km = 40 km Step 2: Remaining distance after the first day Remaining distance after the first day = 140 km - 40 km = 100 km Step 3: Distance covered on the second day Distance covered on the second day = 80% * 100 km = 0.8 * 100 km = 80 km Step 4: Remaining distance after the second day Remaining distance after the second day = 100 km - 80 km = 20 km Step 5: Distance covered on the third day Distance covered on the third day = 140 km - 20 km = 120 km #### Answer The tourists covered **120 km** on the third day. Please let me know if I can help you with anything else.