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

Charlie, Adam and Bryan have some beads.
After Charlie's number of beads is doubled,
Adam's number of beads is increased by 12 and
Bryan's number of beads is reduced by 6,
the ratio of the number of stickers of Charlie to Adam to Bryan becomes 4 : 6 : 5.

Let the number of stickers that Bryan has in the end be 5 u.

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

	Charlie	Adam	Bryan
Before	2 u	6 u - 12	5 u + 6
Change	x 2	+ 12	- 6
After	4 u	6 u	5 u

(a)
Change information into units.

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

(b)
Number of beads that Adam has at first = 6 u - 12

(c)
Number of beads that Bryan has at first = 5 u + 6

(d)
Total number of beads that they have at first
= 2 u + 6 u - 12 + 5 u + 6
= 2 u + 6 u + 5 u - 12 + 6 
= 13 u - 6

Answer(s): (a) 2 u; (b) 6 u - 12; (c) 5 u + 6; (d) 13 u - 6