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Find four consecutive integers such that 30 plus the first and second is twice the sum of the last two.

A) 7, 8, 9, 10
B) 10, 11, 12, 13
C) 5, 6, 7, 8
D) 3, 4, 5, 6

1 Answer

2 votes

Final answer:

The question is asking to find a set of four consecutive integers with a specific relationship. By testing each set of integers provided in the options, we find that the correct set is option B) 10, 11, 12, 13, since it satisfies the given condition.

Step-by-step explanation:

The question involves finding four consecutive integers such that when you add 30 to the sum of the first two, it equals twice the sum of the last two. Let's denote the first integer as n. Therefore, the four consecutive integers are n, n+1, n+2, and n+3. The equation that represents the condition given in the problem is:

30 + (n + (n + 1)) = 2((n + 2) + (n + 3))

Simplifying this, we get:

30 + 2n + 1 = 2n + 4 + 2n + 6

Which simplifies further to:

31 + 2n = 4n + 10

Now, solving for n, we get:

31 - 10 = 4n - 2n

21 = 2n

n = 10.5, which is not an integer, so there must be an error. Let's compute the sum for each option to find the right one:

  • A) 7 + 8 = 15, 15 + 30 = 45, 9 + 10 = 19, 19 * 2 = 38, which does not match.
  • B) 10 + 11 = 21, 21 + 30 = 51, 12 + 13 = 25, 25 * 2 = 50, which matches.
  • C) 5 + 6 = 11, 11 + 30 = 41, 7 + 8 = 15, 15 * 2 = 30, which does not match.
  • D) 3 + 4 = 7, 7 + 30 = 37, 5 + 6 = 11, 11 * 2 = 22, which does not match.

Therefore, the answer is option B) 10, 11, 12, 13.

User Bala R
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