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What is the next number in the series: 10, 20, 30, 40, ?

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Question: What is the next number in the series: 10, 20, 30, 40, ?

Options:

  1. 45
  2. 50
  3. 55
  4. 60

Correct Answer: 50

Solution: 

The series increases by 10 each time: 10, 20, 30, 40, next is 50.

What is the next number in the series: 10, 20, 30, 40, ?

Practice Questions

Q1
What is the next number in the series: 10, 20, 30, 40, ?
  1. 45
  2. 50
  3. 55
  4. 60

Questions & Step-by-Step Solutions

What is the next number in the series: 10, 20, 30, 40, ?
  • Step 1: Look at the first number in the series, which is 10.
  • Step 2: Look at the second number in the series, which is 20.
  • Step 3: Find the difference between the first and second numbers: 20 - 10 = 10.
  • Step 4: Look at the third number in the series, which is 30.
  • Step 5: Find the difference between the second and third numbers: 30 - 20 = 10.
  • Step 6: Look at the fourth number in the series, which is 40.
  • Step 7: Find the difference between the third and fourth numbers: 40 - 30 = 10.
  • Step 8: Notice that each number increases by 10.
  • Step 9: To find the next number, add 10 to the last number (40): 40 + 10 = 50.
  • Step 10: The next number in the series is 50.
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