Question

Find the missing number.

9, ?, 16
64, 10, 36
144, 20, 256

a) 20
b) 40
c) 5
d) 0​

Answer 1

Correct option is 5.

144 + 256 = 400 = (20)²

64 + 36 = 100 = (10)²

9 + 16 = 25 = (5)²

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Answer 2

Answer:

c) 5

Step-by-step explanation:

In second row numbers are 64, 10, 36. Take 64 as A, 10 as B and 36 as C.

Used formula:

(A + C)½ = B

Apply this rule on second row,

→ (64 + 36)½ = 10

→ (100)½ = 10

→ 10 = 10

In third row numbers are 144, 20 and 256. Take 144 as A, 20 as B and 256 as C.

→ (144 + 256)½ = 20

→ (400)½ = 20

→ 20 = 20

In first row numbers are 9 and 16. Assume the middle one ya missing number as x. So, take 9 as A, x as B and 16 as C.

→ (9 + 16)½ = x

→ (25)½ = x

→ 5 = x

Hence, the missing number is 5.