Hint
It will take a while to check 1 x 7, 2 x 7, 3 x 7. What do we know about the answer?
Answer
63,492 x 7 = 444,444
Reasoning
We can work backwards, as we know that the number multiplied by 7 has only 4's. We can try the following:
4 ÷ 7 ≈ 0.57 x
44 ÷ 7 ≈ 6.29 x
444 ÷ 7 ≈ 63.43 x
4,444 ÷ 7 ≈ 634.86 x
44,444 ÷ 7 ≈ 6,349.14 x
444,444 ÷ 7 = 63,492
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Puzzle 16
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