Puzzle 1: What number replaces the question mark?
1 + 1 = 8
2 + 2 = 32
3 + 3 = 72
4 + 4 = ?
Answer: 128
4 (1 + 1) = 8
8 (2 + 2) = 32
12 (3 + 3) =72
16 (4 + 4) = 128
Puzzle 2: What comes next in the sequence?
1 + 5 = 18
2 + 10 = 36
3 + 15 = 54
4 + 20 =?
Answer: 72
The logic applied here is 3 (a + b)
3 (1 + 5) = 18
3(2 + 10) = 36
3(3 + 15) = 54
3(4 + 20) =72
Puzzle 3: What number replaces the question mark?
If 1 x 1 = 2
2 x 2 = 4
3 x 3 =6
4 x 4 = 8
Then 4 x 1 =?
Answer: 5
The logic applied here is (a + b)
So, 4 + 1 = 5
Puzzle 4: What number replaces the question mark?
6 8 3
9 5 1
7 ? 4
Answer: Sum of numbers on each line is 15.
6 + 5 + 4 = 15
3 + 5 + 7 = 15
9 + 5 + 1 = 15
8 + 5 + 2 = 15
So, answer is 2.
Puzzle 5: What number replaces the question mark?
If 1 – 1 = 0
2 – 1 = 3
3 – 1 = 8
Then 5 – 1 =?
Answer: 24
1 x 1 – 1 = 0
2 x 2 – 1 = 3
3 x 3 – 1 = 8
5 x 5 – 1 = 24