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Every Sunday, Suman walks 4 km. For the rest of the week, she walks each day 1 km more than the previous day. How many km does she walk in 3 weeks?

A. 124 km

Answer :

Final answer:

Suman walks a total of 147 km in 3 weeks by walking 4 km every Sunday and increasing the distance by 1 km each day for the rest of the week.

Explanation:

To find out how many kilometers Suman walks in 3 weeks, we need to determine the total distance she walks each week and then multiply it by 3.

Every Sunday, Suman walks 4 km. Let's calculate the distances she walks for the rest of the week:

  1. On Monday, she walks 1 km more than Sunday, so she walks 4 + 1 = 5 km.
  2. On Tuesday, she walks 1 km more than Monday, so she walks 5 + 1 = 6 km.
  3. On Wednesday, she walks 1 km more than Tuesday, so she walks 6 + 1 = 7 km.
  4. On Thursday, she walks 1 km more than Wednesday, so she walks 7 + 1 = 8 km.
  5. On Friday, she walks 1 km more than Thursday, so she walks 8 + 1 = 9 km.
  6. On Saturday, she walks 1 km more than Friday, so she walks 9 + 1 = 10 km.

Now we can calculate the total distance she walks in one week: 4 + 5 + 6 + 7 + 8 + 9 + 10 = 49 km.

Since there are 3 weeks, we multiply the total distance by 3: 49 x 3 = 147 km.

Therefore, Suman walks 147 km in 3 weeks.

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