Fill in the blanks in units (Eg 3 u) or unit equations (Eg 1 u + 2).

Bryan, Adam and Charlie have some beads.
After Bryan's number of beads is doubled,
Adam's number of beads is increased by 12 and
Charlie's number of beads is reduced by 7,
the ratio of the number of stickers of Bryan to Adam to Charlie becomes 8 : 3 : 3.

Let the number of stickers that Charlie has in the end be 3 u.

1. Number of beads that Bryan has at first = _____
2. Number of beads that Adam has at first = _____
3. Number of beads that Charlie has at first = _____
4. Total number of beads that they have at first = _____

	Bryan	Adam	Charlie
Before	4 u	3 u - 12	3 u + 7
Change	x 2	+ 12	- 7
After	8 u	3 u	3 u

(a)
Change information into units.

Number of beads that Bryan has at first
= 8 u ÷ 2
= 4 u

(b)
Number of beads that Adam has at first = 3 u - 12

(c)
Number of beads that Charlie has at first = 3 u + 7

(d)
Total number of beads that they have at first
= 4 u + 3 u - 12 + 3 u + 7
= 4 u + 3 u + 3 u - 12 + 7 
= 10 u - 5

Answer(s): (a) 4 u; (b) 3 u - 12; (c) 3 u + 7; (d) 10 u - 5