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Question (11)

QN0020182

If the bottom row is 10, 6, 4, the topmost number is:

(A) 24
(B) 25
(C) 26
(D) 27

Correct Answer: C

Explanation:

10 + 2×6 + 4 = 26.

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Question (12)

QN0020183

The middle row of a pyramid with bottom row 8, 11, 4 is:

(A) 19, 15
(B) 19, 7
(C) 12, 15
(D) 11, 4

Correct Answer: A

Explanation:

8 + 11 = 19 and 11 + 4 = 15.

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Question (13)

QN0020184

If the middle row contains 12 and 15, the top number is:

(A) 25
(B) 26
(C) 27
(D) 28

Correct Answer: C

Explanation:

12 + 15 = 27.

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Question (14)

QN0020185

If the bottom row is 1, 8, 9, the topmost number is:

(A) 24
(B) 25
(C) 26
(D) 27

Correct Answer: C

Explanation:

1 + 2×8 + 9 = 26.

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Question (15)

QN0020186

If the bottom row is 12, 7, 2, the topmost number is:

(A) 27
(B) 28
(C) 29
(D) 30

Correct Answer: B

Explanation:

12 + 2×7 + 2 = 28.

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Question (16)

QN0020187

If the bottom row is 15, 5, 10, the topmost number is:

(A) 33
(B) 34
(C) 35
(D) 36

Correct Answer: C

Explanation:

15 + 2×5 + 10 = 35.

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Question (17)

QN0020188

If the topmost number is 31 and the bottom row is 7, x, 8, then x equals:

(A) 7
(B) 8
(C) 9
(D) 10

Correct Answer: B

Explanation:

7 + 2x + 8 = 31 ⇒ x = 8.

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Question (18)

QN0020189

Which bottom-row entry contributes twice to the top expression of a three-row pyramid?

(A) Left entry
(B) Middle entry
(C) Right entry
(D) None

Correct Answer: B

Explanation:

The middle term appears in both sums.

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Question (19)

QN0020190

If the bottom row is 20, 4, 6, the topmost number is:

(A) 32
(B) 33
(C) 34
(D) 35

Correct Answer: C

Explanation:

20 + 2×4 + 6 = 34.

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Question (20)

QN0020191

If the bottom row is 3, 12, 9, the topmost number is:

(A) 34
(B) 35
(C) 36
(D) 37

Correct Answer: C

Explanation:

3 + 2×12 + 9 = 36.

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