Answer: Option [B]Solution:
The sum of the two numbers in the upper part is seven times the number in the lower part.
i.e. (25 + 17) ÷ 7 = 6
(38 + 18) ÷ 7 = 8
So, the missing number = (89 + 16) ÷ 7 = 105 ÷ 7 = 15
Answer: Option [B]
Solution:
(5 × 6 × 4) ÷ 10 = 12
(6 × 7 × 5) ÷ 10 = 21
So, missing number = (4 × 8 × 10) ÷ 10 = 32
Answer: Option [A]
Solution:
52 + 42 = 41
62 + 72 = 85
Hence, missing number = 22 + 32 = 4 + 9 = 13
Answer: Option [A]
Solution:
(16 + 14) ÷ 2 = 30 ÷ 2 = 15
(21 + 15) ÷ 2 = 36 ÷ 2 = 18
So, (17 + x) ÷ 2 = 13 ⇒ 17 + x = 26 ⇒ x = 26 - 17 ⇒ x = 9
Answer: Option [A]
Solution:
The number at the bottom is HCF of the rest of the number.
So, missing number is = HCF of 2, 7 and 8 = 1
Answer: Option [B]
Solution:
95 - (27 + 63) = 5
79 - (38 + 37) = 4
So, missing number = 67 - (18 + 42) = 7
Answer: Option [D]
Solution:
39 = (3 × 3) + (6 × 5)
51 = (4 × 4) + (5 × 7)
So, missing number = (7 × 5) + (4 × 5) = 55
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