Fill in the blanks in numbers, units or unit equations.
Adam and Bryan have some stickers.
When Adam gives 15 to Bryan,
the number of stickers he has left is 3 times as many as that of Bryan's.
Let the number of stickers that Bryan has in the end be 1 u.
- Number of stickers that Adam has in the end = _____
- Number of stickers that Adam has at first = _____
- Number of stickers that Bryan has at first = _____
- If Adam has 40 stickers more than Bryan at first, find 1 u.