Series Riddles

24

Explanation:
21 * 4 - (4 * 4) = 68
12 * 4 - (4 * 4) = 32
17 * 4 - (4 * 4) = 52
10 * 4 - (4 * 4) = 24

569

The Central number is formed by there greatest factor of 15 12 and 18
15=> 3 * 5 => greatest factor is 5
12=> 2 * 6 => greatest factor is 6
18=> 2 * 9 => greatest factor is 9.

RY

The list is formed by using last two letter of planet's names in the order from Neptune To Mercury

NEPTU:NE
URAN:US
SATU:RN
JUPIT:ER
MA:RS
EAR:TH
VEN:US
MERCU:RY

89

(1st-number * 2nd-number) + (1st-number + 2nd-number) = 3rd number.
(3 x 1) + (3 + 1) = 3 + 4 => 7
(6 x 4) + (6 + 4) = 24 + 10 => 34
(8 x 7) + (8 + 7) = 56 + 15 => 71
(9 x 8) + (9 + 8) = 72 + 17 => 89 ... (Answer)

40 or 96

Explanation:
Solution A :
Add the rhs of the last line to the current line
1 + 4 = 5
5 + 2 + 5 = 12
12 + 3 + 6 = 21
21 + 8 + 11 = 40

Solution B :
RHS = 1ST NUMBER + (1ST NUMBER * 2ND NUMBER)
1 + (1 x 4) = 5
2 + (2 x 5) = 12
3 + (3 x 6) = 21
8 + (8 x 11) = 96

4.

The 1st picture has 9 connecting dots / crossed lines.
The 2nd picture has one connecting dot / crossed line.
The last picture has 4 connecting dots / crossed lines.

B

every next plate makes a 1/4 turn clockwise.

Every segment in the new circle moves 90 degrees clockwise.

E = 3333

T = 7+7+7+7 = TWENTY EIFH(T)
R = 1+1+1+1 = FOU(R)
Y = 5+5+5+5 = TWENT(Y)
N = 4+4+4+4 = SIXTEE(N)

3+3+3+3 = TWELV(E)

63

Starting with 3:
3 * 2 + 1 = 7
7 * 2 + 1 = 15
15 * 2 + 1 = 31

Continuing this pattern:
31 * 2 + 1 = 63

So, using the pattern of multiplying by 2 and adding 1, the missing number in the sequence is 63.