Hint
The sequence involves both adding and multiplying in some way.
Answer
153.
The sequence is created using: +1 x1 +2 x2 +3 x3 +4 x4 +5.
?
Puzzle 4
My first is in mammoth, but not in elephant.
My second is in raccoon, but not in beaver.
My third is in dobbin, but not in horse.
My fourth is in koala, and in kangaroo.
My fifth is in tiger, but not in lion.
My last is in pony, but not in horse.
What am I?
Hint
My first letter is M, and watch out for the wording for the 4th letter.
Answer
A monkey.
Reasoning
The 1st letter can be: M O
The 2nd letter can be: C O N
The 3rd letter can be: D B I N
The 4th letter can be: K O A
The 5th letter can be: T G E R
The 6th letter can be: P N Y
